2 * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * SPDX-License-Identifier: LGPL-2.1-only
8 #include "common/compat/string.h"
9 #include "common/macros.h"
10 #include "lttng/lttng-error.h"
12 #include <common/buffer-view.h>
13 #include <common/dynamic-array.h>
14 #include <common/dynamic-buffer.h>
15 #include <common/error.h>
16 #include <common/sessiond-comm/sessiond-comm.h>
17 #include <lttng/constant.h>
18 #include <lttng/event-internal.h>
19 #include <lttng/event.h>
20 #include <lttng/userspace-probe-internal.h>
24 struct event_list_element
{
25 struct lttng_event
*event
;
26 struct lttng_event_exclusion
*exclusions
;
27 char *filter_expression
;
30 static void event_list_destructor(void *ptr
)
32 struct event_list_element
*element
= (struct event_list_element
*) ptr
;
34 free(element
->filter_expression
);
35 free(element
->exclusions
);
36 lttng_event_destroy(element
->event
);
41 struct lttng_event
*lttng_event_copy(const struct lttng_event
*event
)
43 struct lttng_event
*new_event
;
44 struct lttng_event_extended
*new_event_extended
;
46 new_event
= zmalloc(sizeof(*event
));
48 PERROR("Error allocating event structure");
52 /* Copy the content of the old event. */
53 memcpy(new_event
, event
, sizeof(*event
));
56 * We need to create a new extended since the previous pointer is now
59 new_event_extended
= zmalloc(sizeof(*new_event_extended
));
60 if (!new_event_extended
) {
61 PERROR("Error allocating event extended structure");
65 new_event
->extended
.ptr
= new_event_extended
;
74 static int lttng_event_probe_attr_serialize(
75 const struct lttng_event_probe_attr
*probe
,
76 struct lttng_dynamic_buffer
*buf
)
79 size_t symbol_name_len
;
80 struct lttng_event_probe_attr_comm comm
= { 0 };
82 symbol_name_len
= lttng_strnlen(probe
->symbol_name
, LTTNG_SYMBOL_NAME_LEN
);
83 if (symbol_name_len
== LTTNG_SYMBOL_NAME_LEN
) {
84 /* Not null-termintated. */
89 /* Include the null terminator. */
92 comm
.symbol_name_len
= (uint32_t) symbol_name_len
;
93 comm
.addr
= probe
->addr
;
94 comm
.offset
= probe
->addr
;
96 ret
= lttng_dynamic_buffer_append(buf
, &comm
, sizeof(comm
));
102 ret
= lttng_dynamic_buffer_append(buf
, probe
->symbol_name
, symbol_name_len
);
108 static int lttng_event_function_attr_serialize(
109 const struct lttng_event_function_attr
*function
,
110 struct lttng_dynamic_buffer
*buf
)
113 size_t symbol_name_len
;
114 struct lttng_event_function_attr_comm comm
= { 0 };
116 symbol_name_len
= lttng_strnlen(function
->symbol_name
, LTTNG_SYMBOL_NAME_LEN
);
117 if (symbol_name_len
== LTTNG_SYMBOL_NAME_LEN
) {
118 /* Not null-termintated. */
123 /* Include the null terminator. */
124 symbol_name_len
+= 1;
126 comm
.symbol_name_len
= (uint32_t) symbol_name_len
;
128 ret
= lttng_dynamic_buffer_append(buf
, &comm
, sizeof(comm
));
134 ret
= lttng_dynamic_buffer_append(buf
, function
->symbol_name
, symbol_name_len
);
139 static ssize_t
lttng_event_probe_attr_create_from_buffer(
140 const struct lttng_buffer_view
*view
,
141 struct lttng_event_probe_attr
**probe_attr
)
143 ssize_t ret
, offset
= 0;
144 const struct lttng_event_probe_attr_comm
*comm
;
145 struct lttng_event_probe_attr
*local_attr
= NULL
;
146 const struct lttng_buffer_view comm_view
= lttng_buffer_view_from_view(
147 view
, offset
, sizeof(*comm
));
149 if (!lttng_buffer_view_is_valid(&comm_view
)) {
154 comm
= (typeof(comm
)) view
->data
;
155 offset
+= sizeof(*comm
);
157 local_attr
= zmalloc(sizeof(*local_attr
));
158 if (local_attr
== NULL
) {
163 local_attr
->addr
= comm
->addr
;
164 local_attr
->offset
= comm
->offset
;
168 const struct lttng_buffer_view name_view
=
169 lttng_buffer_view_from_view(view
, offset
,
170 comm
->symbol_name_len
);
171 if (!lttng_buffer_view_is_valid(&name_view
)) {
176 name
= name_view
.data
;
178 if (!lttng_buffer_view_contains_string(
179 &name_view
, name
, comm
->symbol_name_len
)) {
184 ret
= lttng_strncpy(local_attr
->symbol_name
, name
,
185 LTTNG_SYMBOL_NAME_LEN
);
190 offset
+= comm
->symbol_name_len
;
193 *probe_attr
= local_attr
;
200 static ssize_t
lttng_event_function_attr_create_from_buffer(
201 const struct lttng_buffer_view
*view
,
202 struct lttng_event_function_attr
**function_attr
)
204 ssize_t ret
, offset
= 0;
205 const struct lttng_event_function_attr_comm
*comm
;
206 struct lttng_event_function_attr
*local_attr
= NULL
;
207 const struct lttng_buffer_view comm_view
= lttng_buffer_view_from_view(
208 view
, offset
, sizeof(*comm
));
210 if (!lttng_buffer_view_is_valid(&comm_view
)) {
215 comm
= (typeof(comm
)) view
->data
;
216 offset
+= sizeof(*comm
);
218 local_attr
= zmalloc(sizeof(*local_attr
));
219 if (local_attr
== NULL
) {
226 const struct lttng_buffer_view name_view
=
227 lttng_buffer_view_from_view(view
, offset
,
228 comm
->symbol_name_len
);
229 if (!lttng_buffer_view_is_valid(&name_view
)) {
234 name
= name_view
.data
;
236 if (!lttng_buffer_view_contains_string(
237 &name_view
, name
, comm
->symbol_name_len
)) {
242 ret
= lttng_strncpy(local_attr
->symbol_name
, name
,
243 LTTNG_SYMBOL_NAME_LEN
);
248 offset
+= comm
->symbol_name_len
;
251 *function_attr
= local_attr
;
258 static ssize_t
lttng_event_exclusions_create_from_buffer(const struct lttng_buffer_view
*view
,
259 uint32_t count
, struct lttng_event_exclusion
**exclusions
)
261 ssize_t ret
, offset
= 0;
262 size_t size
= (count
* LTTNG_SYMBOL_NAME_LEN
);
264 const struct lttng_event_exclusion_comm
*comm
;
265 struct lttng_event_exclusion
*local_exclusions
;
268 local_exclusions
= zmalloc(sizeof(struct lttng_event_exclusion
) + size
);
269 if (!local_exclusions
) {
273 local_exclusions
->count
= count
;
275 for (i
= 0; i
< count
; i
++) {
277 struct lttng_buffer_view string_view
;
278 const struct lttng_buffer_view comm_view
=
279 lttng_buffer_view_from_view(
280 view
, offset
, sizeof(*comm
));
282 if (!lttng_buffer_view_is_valid(&comm_view
)) {
287 comm
= (typeof(comm
)) comm_view
.data
;
288 offset
+= sizeof(*comm
);
290 string_view
= lttng_buffer_view_from_view(
291 view
, offset
, comm
->len
);
293 if (!lttng_buffer_view_is_valid(&string_view
)) {
298 string
= string_view
.data
;
300 if (!lttng_buffer_view_contains_string(
301 &string_view
, string
, comm
->len
)) {
307 local_exclusions
->names
[i
],
316 *exclusions
= local_exclusions
;
317 local_exclusions
= NULL
;
320 free(local_exclusions
);
326 ssize_t
lttng_event_create_from_buffer(const struct lttng_buffer_view
*view
,
327 struct lttng_event
**event
,
328 struct lttng_event_exclusion
**exclusion
,
329 char **filter_expression
,
330 struct lttng_filter_bytecode
**bytecode
,
333 ssize_t ret
, offset
= 0;
334 struct lttng_event
*local_event
= NULL
;
335 struct lttng_event_exclusion
*local_exclusions
= NULL
;
336 struct lttng_filter_bytecode
*local_bytecode
= NULL
;
337 char *local_filter_expression
= NULL
;
338 const struct lttng_event_comm
*event_comm
;
339 struct lttng_event_function_attr
*local_function_attr
= NULL
;
340 struct lttng_event_probe_attr
*local_probe_attr
= NULL
;
341 struct lttng_userspace_probe_location
*local_userspace_probe_location
=
343 int received_fd
= -1;
346 * Only event is obligatory, the other output argument are optional and
347 * depends on what the caller is interested in.
353 const struct lttng_buffer_view comm_view
=
354 lttng_buffer_view_from_view(view
, offset
,
355 sizeof(*event_comm
));
357 if (!lttng_buffer_view_is_valid(&comm_view
)) {
362 /* lttng_event_comm header */
363 event_comm
= (typeof(event_comm
)) comm_view
.data
;
364 offset
+= sizeof(*event_comm
);
367 local_event
= lttng_event_create();
368 if (local_event
== NULL
) {
373 local_event
->type
= event_comm
->event_type
;
374 local_event
->loglevel_type
= event_comm
->loglevel_type
;
375 local_event
->loglevel
= event_comm
->loglevel
;
376 local_event
->enabled
= event_comm
->enabled
;
377 local_event
->pid
= event_comm
->pid
;
378 local_event
->flags
= event_comm
->flags
;
382 const struct lttng_buffer_view name_view
=
383 lttng_buffer_view_from_view(view
, offset
,
384 event_comm
->name_len
);
385 if (!lttng_buffer_view_is_valid(&name_view
)) {
390 name
= name_view
.data
;
392 if (!lttng_buffer_view_contains_string(
393 &name_view
, name
, event_comm
->name_len
)) {
399 local_event
->name
, name
, LTTNG_SYMBOL_NAME_LEN
);
404 offset
+= event_comm
->name_len
;
408 if (event_comm
->exclusion_count
== 0) {
409 goto deserialize_filter_expression
;
414 const struct lttng_buffer_view exclusions_view
=
415 lttng_buffer_view_from_view(
418 if (!lttng_buffer_view_is_valid(&exclusions_view
)) {
423 ret
= lttng_event_exclusions_create_from_buffer(&exclusions_view
,
424 event_comm
->exclusion_count
, &local_exclusions
);
431 local_event
->exclusion
= 1;
434 deserialize_filter_expression
:
436 if (event_comm
->filter_expression_len
== 0) {
437 if (event_comm
->bytecode_len
!= 0) {
439 * This is an invalid event payload.
441 * Filter expression without bytecode is possible but
442 * not the other way around.
447 goto deserialize_event_type_payload
;
451 const char *filter_expression_buffer
;
452 const struct lttng_buffer_view filter_expression_view
=
453 lttng_buffer_view_from_view(view
, offset
,
454 event_comm
->filter_expression_len
);
456 if (!lttng_buffer_view_is_valid(&filter_expression_view
)) {
461 filter_expression_buffer
= filter_expression_view
.data
;
463 if (!lttng_buffer_view_contains_string(&filter_expression_view
,
464 filter_expression_buffer
,
465 event_comm
->filter_expression_len
)) {
470 local_filter_expression
= lttng_strndup(
471 filter_expression_buffer
,
472 event_comm
->filter_expression_len
);
473 if (!local_filter_expression
) {
478 local_event
->filter
= 1;
480 offset
+= event_comm
->filter_expression_len
;
483 if (event_comm
->bytecode_len
== 0) {
485 * Filter expression can be present but without bytecode
486 * when dealing with event listing.
488 goto deserialize_event_type_payload
;
493 const struct lttng_buffer_view bytecode_view
=
494 lttng_buffer_view_from_view(view
, offset
,
495 event_comm
->bytecode_len
);
497 if (!lttng_buffer_view_is_valid(&bytecode_view
)) {
502 local_bytecode
= zmalloc(event_comm
->bytecode_len
);
503 if (!local_bytecode
) {
508 memcpy(local_bytecode
, bytecode_view
.data
,
509 event_comm
->bytecode_len
);
510 if ((local_bytecode
->len
+ sizeof(*local_bytecode
)) !=
511 event_comm
->bytecode_len
) {
516 offset
+= event_comm
->bytecode_len
;
519 deserialize_event_type_payload
:
520 /* Event type specific payload */
521 switch (local_event
->type
) {
522 case LTTNG_EVENT_FUNCTION
:
524 case LTTNG_EVENT_PROBE
:
526 const struct lttng_buffer_view probe_attr_view
=
527 lttng_buffer_view_from_view(view
, offset
,
528 event_comm
->lttng_event_probe_attr_len
);
530 if (event_comm
->lttng_event_probe_attr_len
== 0) {
535 if (!lttng_buffer_view_is_valid(&probe_attr_view
)) {
540 ret
= lttng_event_probe_attr_create_from_buffer(
541 &probe_attr_view
, &local_probe_attr
);
542 if (ret
< 0 || ret
!= event_comm
->lttng_event_probe_attr_len
) {
547 /* Copy to the local event. */
548 memcpy(&local_event
->attr
.probe
, local_probe_attr
,
549 sizeof(local_event
->attr
.probe
));
554 case LTTNG_EVENT_FUNCTION_ENTRY
:
556 const struct lttng_buffer_view function_attr_view
=
557 lttng_buffer_view_from_view(view
, offset
,
558 event_comm
->lttng_event_function_attr_len
);
560 if (event_comm
->lttng_event_function_attr_len
== 0) {
565 if (!lttng_buffer_view_is_valid(&function_attr_view
)) {
570 ret
= lttng_event_function_attr_create_from_buffer(
571 &function_attr_view
, &local_function_attr
);
572 if (ret
< 0 || ret
!= event_comm
->lttng_event_function_attr_len
) {
577 /* Copy to the local event. */
578 memcpy(&local_event
->attr
.ftrace
, local_function_attr
,
579 sizeof(local_event
->attr
.ftrace
));
585 case LTTNG_EVENT_USERSPACE_PROBE
:
587 const struct lttng_buffer_view userspace_probe_location_view
=
588 lttng_buffer_view_from_view(view
, offset
,
589 event_comm
->userspace_probe_location_len
);
590 const struct lttng_userspace_probe_location_lookup_method
593 if (event_comm
->userspace_probe_location_len
== 0) {
598 if (!lttng_buffer_view_is_valid(
599 &userspace_probe_location_view
)) {
604 ret
= lttng_userspace_probe_location_create_from_buffer(
605 &userspace_probe_location_view
,
606 &local_userspace_probe_location
);
608 WARN("Failed to create a userspace probe location from the received buffer");
613 if (ret
!= event_comm
->userspace_probe_location_len
) {
614 WARN("Userspace probe location from the received buffer is not the advertised length: header length = %" PRIu32
", payload length = %lu", event_comm
->userspace_probe_location_len
, ret
);
621 * The userspace FD is simply not sent and we do not
622 * care about it. This happens on listing.
624 goto attach_userspace_probe_to_event
;
628 * Receive the file descriptor to the target binary from the
631 DBG("Receiving userspace probe target FD from client ...");
632 ret
= lttcomm_recv_fds_unix_sock(sock
, &received_fd
, 1);
634 DBG("Nothing recv() from client userspace probe fd... continuing");
639 * Set the file descriptor received from the client through the
640 * unix socket in the probe location.
642 lookup
= lttng_userspace_probe_location_get_lookup_method(
643 local_userspace_probe_location
);
645 ret
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
650 * From the kernel tracer's perspective, all userspace probe
651 * event types are all the same: a file and an offset.
653 switch (lttng_userspace_probe_location_lookup_method_get_type(
655 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF
:
656 ret
= lttng_userspace_probe_location_function_set_binary_fd(
657 local_userspace_probe_location
,
660 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT
:
661 ret
= lttng_userspace_probe_location_tracepoint_set_binary_fd(
662 local_userspace_probe_location
,
666 ret
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
671 ret
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
675 /* Fd transfered to the object. */
678 attach_userspace_probe_to_event
:
680 /* Attach the probe location to the event. */
681 ret
= lttng_event_set_userspace_probe_location(
682 local_event
, local_userspace_probe_location
);
684 ret
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
689 * Userspace probe location object ownership transfered to the
692 local_userspace_probe_location
= NULL
;
693 offset
+= event_comm
->userspace_probe_location_len
;
696 case LTTNG_EVENT_TRACEPOINT
:
698 case LTTNG_EVENT_ALL
:
700 case LTTNG_EVENT_SYSCALL
:
702 case LTTNG_EVENT_NOOP
:
703 /* Nothing to do here */
711 /* Transfer ownership to the caller. */
712 *event
= local_event
;
716 *bytecode
= local_bytecode
;
717 local_bytecode
= NULL
;
721 *exclusion
= local_exclusions
;
722 local_exclusions
= NULL
;
725 if (filter_expression
) {
726 *filter_expression
= local_filter_expression
;
727 local_filter_expression
= NULL
;
732 lttng_event_destroy(local_event
);
733 lttng_userspace_probe_location_destroy(local_userspace_probe_location
);
734 free(local_filter_expression
);
735 free(local_exclusions
);
736 free(local_bytecode
);
737 free(local_function_attr
);
738 free(local_probe_attr
);
739 if (received_fd
> -1) {
740 if (close(received_fd
)) {
741 PERROR("Failed to close received fd");
748 int lttng_event_serialize(const struct lttng_event
*event
,
749 unsigned int exclusion_count
,
750 char **exclusion_list
,
751 char *filter_expression
,
754 struct lttng_dynamic_buffer
*buf
,
759 size_t header_offset
, size_before_payload
;
761 struct lttng_event_comm event_comm
= { 0 };
762 struct lttng_event_comm
*header
;
767 /* Save the header location for later in-place header update. */
768 header_offset
= buf
->size
;
770 name_len
= lttng_strnlen(event
->name
, LTTNG_SYMBOL_NAME_LEN
);
771 if (name_len
== LTTNG_SYMBOL_NAME_LEN
) {
772 /* Event name is not NULL-terminated. */
777 /* Add null termination. */
780 if (exclusion_count
> UINT32_MAX
) {
781 /* Possible overflow. */
786 if (bytecode_len
> UINT32_MAX
) {
787 /* Possible overflow. */
792 event_comm
.name_len
= (uint32_t) name_len
;
793 event_comm
.event_type
= (int8_t) event
->type
;
794 event_comm
.loglevel_type
= (int8_t) event
->loglevel_type
;
795 event_comm
.loglevel
= (int32_t) event
->loglevel
;
796 event_comm
.enabled
= (int8_t) event
->enabled
;
797 event_comm
.pid
= (int32_t) event
->pid
;
798 event_comm
.exclusion_count
= (uint32_t) exclusion_count
;
799 event_comm
.bytecode_len
= (uint32_t) bytecode_len
;
800 event_comm
.flags
= (int32_t) event
->flags
;
802 if (filter_expression
) {
803 event_comm
.filter_expression_len
=
804 strlen(filter_expression
) + 1;
808 ret
= lttng_dynamic_buffer_append(buf
, &event_comm
, sizeof(event_comm
));
814 ret
= lttng_dynamic_buffer_append(buf
, event
->name
, name_len
);
820 for (i
= 0; i
< exclusion_count
; i
++) {
821 size_t exclusion_len
;
822 struct lttng_event_exclusion_comm exclusion_comm
= { 0 };
824 assert(exclusion_list
);
826 exclusion_len
= lttng_strnlen(
827 *(exclusion_list
+ i
), LTTNG_SYMBOL_NAME_LEN
);
828 if (exclusion_len
== LTTNG_SYMBOL_NAME_LEN
) {
829 /* Exclusion is not NULL-terminated. */
834 /* Include null terminator '\0'. */
837 exclusion_comm
.len
= exclusion_len
;
839 ret
= lttng_dynamic_buffer_append(buf
, &exclusion_comm
, sizeof(exclusion_comm
));
844 ret
= lttng_dynamic_buffer_append(buf
, *(exclusion_list
+ i
),
851 /* Filter expression and its bytecode */
852 if (filter_expression
) {
853 ret
= lttng_dynamic_buffer_append(buf
, filter_expression
,
854 event_comm
.filter_expression_len
);
860 * Bytecode can be absent when we serialize to the client
864 ret
= lttng_dynamic_buffer_append(
865 buf
, bytecode
, bytecode_len
);
872 size_before_payload
= buf
->size
;
874 /* Event type specific payload */
875 switch (event
->type
) {
876 case LTTNG_EVENT_FUNCTION
:
878 case LTTNG_EVENT_PROBE
:
879 ret
= lttng_event_probe_attr_serialize(&event
->attr
.probe
, buf
);
885 header
= (struct lttng_event_comm
*) ((char *) buf
->data
+
887 header
->lttng_event_probe_attr_len
=
888 buf
->size
- size_before_payload
;
891 case LTTNG_EVENT_FUNCTION_ENTRY
:
892 ret
= lttng_event_function_attr_serialize(
893 &event
->attr
.ftrace
, buf
);
899 /* Update the lttng_event_function_attr len. */
900 header
= (struct lttng_event_comm
*) ((char *) buf
->data
+
902 header
->lttng_event_function_attr_len
=
903 buf
->size
- size_before_payload
;
906 case LTTNG_EVENT_USERSPACE_PROBE
:
908 struct lttng_event_extended
*ev_ext
=
909 (struct lttng_event_extended
*)
911 assert(event
->extended
.ptr
);
912 assert(ev_ext
->probe_location
);
914 size_before_payload
= buf
->size
;
915 if (ev_ext
->probe_location
) {
917 * lttng_userspace_probe_location_serialize returns the
918 * number of bytes that were appended to the buffer.
920 ret
= lttng_userspace_probe_location_serialize(
921 ev_ext
->probe_location
, buf
,
928 /* Update the userspace probe location len. */
929 header
= (struct lttng_event_comm
*) ((char *) buf
->data
+
931 header
->userspace_probe_location_len
=
932 buf
->size
- size_before_payload
;
936 case LTTNG_EVENT_TRACEPOINT
:
938 case LTTNG_EVENT_ALL
:
941 /* Nothing to do here */
949 static enum lttng_error_code
compute_flattened_size(
950 struct lttng_dynamic_pointer_array
*events
, size_t *size
)
952 enum lttng_error_code ret_code
;
954 size_t storage_req
, event_count
, i
;
959 event_count
= lttng_dynamic_pointer_array_get_count(events
);
961 /* The basic struct lttng_event */
962 storage_req
= event_count
* sizeof(struct lttng_event
);
964 for (i
= 0; i
< event_count
; i
++) {
965 int probe_storage_req
= 0;
966 const struct event_list_element
*element
=
967 lttng_dynamic_pointer_array_get_pointer(
969 const struct lttng_userspace_probe_location
*location
= NULL
;
971 location
= lttng_event_get_userspace_probe_location(
974 ret
= lttng_userspace_probe_location_flatten(
977 ret_code
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
981 probe_storage_req
= ret
;
984 /* The struct·lttng_event_extended */
985 storage_req
+= event_count
*
986 sizeof(struct lttng_event_extended
);
988 if (element
->filter_expression
) {
989 storage_req
+= strlen(element
->filter_expression
) + 1;
992 if (element
->exclusions
) {
993 storage_req
+= element
->exclusions
->count
*
994 LTTNG_SYMBOL_NAME_LEN
;
997 /* Padding to ensure the flat probe is aligned. */
998 storage_req
= ALIGN_TO(storage_req
, sizeof(uint64_t));
999 storage_req
+= probe_storage_req
;
1002 *size
= storage_req
;
1003 ret_code
= LTTNG_OK
;
1010 * Flatten a list of struct lttng_event.
1012 * The buffer that is returned to the API client must contain a "flat" version
1013 * of the events that are returned. In other words, all pointers within an
1014 * lttng_event must point to a location within the returned buffer so that the
1015 * user may free everything by simply calling free() on the returned buffer.
1016 * This is needed in order to maintain API compatibility.
1018 * A first pass is performed to compute the size of the buffer that must be
1019 * allocated. A second pass is then performed to setup the returned events so
1020 * that their members always point within the buffer.
1022 * The layout of the returned buffer is as follows:
1023 * - struct lttng_event[nb_events],
1024 * - nb_events times the following:
1025 * - struct lttng_event_extended,
1026 * - filter_expression
1028 * - padding to align to 64-bits
1029 * - flattened version of userspace_probe_location
1031 static enum lttng_error_code
flatten_lttng_events(
1032 struct lttng_dynamic_pointer_array
*events
,
1033 struct lttng_event
**flattened_events
)
1035 enum lttng_error_code ret_code
;
1038 struct lttng_dynamic_buffer local_flattened_events
;
1042 assert(flattened_events
);
1044 lttng_dynamic_buffer_init(&local_flattened_events
);
1045 nb_events
= lttng_dynamic_pointer_array_get_count(events
);
1047 ret_code
= compute_flattened_size(events
, &storage_req
);
1048 if (ret_code
!= LTTNG_OK
) {
1053 * We must ensure that "local_flattened_events" is never resized so as
1054 * to preserve the validity of the flattened objects.
1056 ret
= lttng_dynamic_buffer_set_capacity(
1057 &local_flattened_events
, storage_req
);
1059 ret_code
= LTTNG_ERR_NOMEM
;
1063 /* Start by laying the struct lttng_event */
1064 for (i
= 0; i
< nb_events
; i
++) {
1065 struct event_list_element
*element
=
1066 lttng_dynamic_pointer_array_get_pointer(
1070 ret_code
= LTTNG_ERR_FATAL
;
1073 ret
= lttng_dynamic_buffer_append(&local_flattened_events
,
1074 element
->event
, sizeof(struct lttng_event
));
1076 ret_code
= LTTNG_ERR_NOMEM
;
1081 for (i
= 0; i
< nb_events
; i
++) {
1082 struct event_list_element
*element
= lttng_dynamic_pointer_array_get_pointer(events
, i
);
1083 struct lttng_event
*event
= (struct lttng_event
*)
1084 (local_flattened_events
.data
+ (sizeof(struct lttng_event
) * i
));
1085 struct lttng_event_extended
*event_extended
=
1086 (struct lttng_event_extended
*)
1087 (local_flattened_events
.data
+ local_flattened_events
.size
);
1088 const struct lttng_userspace_probe_location
*location
= NULL
;
1092 /* Insert struct lttng_event_extended. */
1093 ret
= lttng_dynamic_buffer_set_size(&local_flattened_events
,
1094 local_flattened_events
.size
+
1095 sizeof(*event_extended
));
1097 ret_code
= LTTNG_ERR_NOMEM
;
1100 event
->extended
.ptr
= event_extended
;
1102 /* Insert filter expression. */
1103 if (element
->filter_expression
) {
1104 size_t len
= strlen(element
->filter_expression
) + 1;
1106 event_extended
->filter_expression
=
1107 local_flattened_events
.data
+
1108 local_flattened_events
.size
;
1109 ret
= lttng_dynamic_buffer_append(
1110 &local_flattened_events
,
1111 element
->filter_expression
, len
);
1113 ret_code
= LTTNG_ERR_NOMEM
;
1118 /* Insert exclusions. */
1119 if (element
->exclusions
) {
1120 event_extended
->exclusions
.count
=
1121 element
->exclusions
->count
;
1122 event_extended
->exclusions
.strings
=
1123 local_flattened_events
.data
+
1124 local_flattened_events
.size
;
1126 ret
= lttng_dynamic_buffer_append(
1127 &local_flattened_events
,
1128 element
->exclusions
->names
,
1129 element
->exclusions
->count
*
1130 LTTNG_SYMBOL_NAME_LEN
);
1132 ret_code
= LTTNG_ERR_NOMEM
;
1137 /* Insert padding to align to 64-bits. */
1138 ret
= lttng_dynamic_buffer_set_size(&local_flattened_events
,
1139 ALIGN_TO(local_flattened_events
.size
,
1142 ret_code
= LTTNG_ERR_NOMEM
;
1146 location
= lttng_event_get_userspace_probe_location(
1149 event_extended
->probe_location
= (struct lttng_userspace_probe_location
*)
1150 (local_flattened_events
.data
+ local_flattened_events
.size
);
1151 ret
= lttng_userspace_probe_location_flatten(
1152 location
, &local_flattened_events
);
1154 ret_code
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
1160 /* Don't reset local_flattened_events buffer as we return its content. */
1161 *flattened_events
= (struct lttng_event
*) local_flattened_events
.data
;
1162 lttng_dynamic_buffer_init(&local_flattened_events
);
1163 ret_code
= LTTNG_OK
;
1165 lttng_dynamic_buffer_reset(&local_flattened_events
);
1169 static enum lttng_error_code
event_list_create_from_buffer(
1170 const struct lttng_buffer_view
*view
,
1172 struct lttng_dynamic_pointer_array
*event_list
)
1174 enum lttng_error_code ret_code
;
1182 for (i
= 0; i
< count
; i
++) {
1184 const struct lttng_buffer_view event_view
=
1185 lttng_buffer_view_from_view(view
, offset
, -1);
1186 struct event_list_element
*element
= zmalloc(sizeof(*element
));
1189 ret_code
= LTTNG_ERR_NOMEM
;
1194 * Lifetime and management of the object is now bound to the
1197 ret
= lttng_dynamic_pointer_array_add_pointer(
1198 event_list
, element
);
1200 event_list_destructor(element
);
1201 ret_code
= LTTNG_ERR_NOMEM
;
1206 * Bytecode is not transmitted on listing in any case we do not
1209 event_size
= lttng_event_create_from_buffer(&event_view
,
1211 &element
->exclusions
,
1212 &element
->filter_expression
, NULL
, -1);
1213 if (event_size
< 0) {
1214 ret_code
= LTTNG_ERR_INVALID
;
1218 offset
+= event_size
;
1221 if (view
->size
!= offset
) {
1222 ret_code
= LTTNG_ERR_INVALID
;
1226 ret_code
= LTTNG_OK
;
1233 enum lttng_error_code
lttng_events_create_and_flatten_from_buffer(
1234 const struct lttng_buffer_view
*view
,
1236 struct lttng_event
**events
)
1238 enum lttng_error_code ret
= LTTNG_OK
;
1239 struct lttng_dynamic_pointer_array local_events
;
1241 lttng_dynamic_pointer_array_init(&local_events
, event_list_destructor
);
1243 /* Deserialize the events */
1245 const struct lttng_buffer_view events_view
=
1246 lttng_buffer_view_from_view(view
, 0, -1);
1248 ret
= event_list_create_from_buffer(
1249 &events_view
, count
, &local_events
);
1250 if (ret
!= LTTNG_OK
) {
1255 ret
= flatten_lttng_events(&local_events
, events
);
1256 if (ret
!= LTTNG_OK
) {
1261 lttng_dynamic_pointer_array_reset(&local_events
);