2 * Copyright (C) 2014 - Jonathan Rajotte <jonathan.r.julien@gmail.com>
3 * - Olivier Cotte <olivier.cotte@polymtl.ca>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include <common/error.h>
25 #include <common/macros.h>
26 #include <common/config/config.h>
27 #include <lttng/lttng.h>
29 /* Don't want to reference snapshot-internal.h here */
30 struct lttng_snapshot_output
;
32 /* Instance of a machine interface writer. */
34 struct config_writer
*writer
;
35 enum lttng_mi_output_type type
;
39 * Version information for the machine interface.
41 struct mi_lttng_version
{
42 char version
[NAME_MAX
]; /* Version number of package */
43 uint32_t version_major
; /* LTTng-Tools major version number */
44 uint32_t version_minor
; /* LTTng-Tools minor version number */
45 uint32_t version_patchlevel
; /* LTTng-Tools patchlevel version number */
46 char version_commit
[NAME_MAX
]; /* Commit hash of the current version */
47 char version_name
[NAME_MAX
];
48 char package_url
[NAME_MAX
]; /* Define to the home page for this package. */
51 /* Strings related to command */
52 extern const char * const mi_lttng_element_command
;
53 extern const char * const mi_lttng_element_command_action
;
54 extern const char * const mi_lttng_element_command_add_context
;
55 extern const char * const mi_lttng_element_command_calibrate
;
56 extern const char * const mi_lttng_element_command_create
;
57 extern const char * const mi_lttng_element_command_destroy
;
58 extern const char * const mi_lttng_element_command_disable_channel
;
59 extern const char * const mi_lttng_element_command_disable_event
;
60 extern const char * const mi_lttng_element_command_enable_channels
;
61 extern const char * const mi_lttng_element_command_enable_event
;
62 extern const char * const mi_lttng_element_command_list
;
63 extern const char * const mi_lttng_element_command_load
;
64 extern const char * const mi_lttng_element_command_name
;
65 extern const char * const mi_lttng_element_command_output
;
66 extern const char * const mi_lttng_element_command_save
;
67 extern const char * const mi_lttng_element_command_set_session
;
68 extern const char * const mi_lttng_element_command_snapshot
;
69 extern const char * const mi_lttng_element_command_snapshot_add
;
70 extern const char * const mi_lttng_element_command_snapshot_del
;
71 extern const char * const mi_lttng_element_command_snapshot_list
;
72 extern const char * const mi_lttng_element_command_snapshot_record
;
73 extern const char * const mi_lttng_element_command_start
;
74 extern const char * const mi_lttng_element_command_stop
;
75 extern const char * const mi_lttng_element_command_success
;
76 extern const char * const mi_lttng_element_command_track
;
77 extern const char * const mi_lttng_element_command_untrack
;
78 extern const char * const mi_lttng_element_command_version
;
80 /* Strings related to version command */
81 extern const char * const mi_lttng_element_version
;
82 extern const char * const mi_lttng_element_version_commit
;
83 extern const char * const mi_lttng_element_version_description
;
84 extern const char * const mi_lttng_element_version_license
;
85 extern const char * const mi_lttng_element_version_major
;
86 extern const char * const mi_lttng_element_version_minor
;
87 extern const char * const mi_lttng_element_version_patch_level
;
88 extern const char * const mi_lttng_element_version_str
;
89 extern const char * const mi_lttng_element_version_web
;
91 /* String related to a lttng_event_field */
92 extern const char * const mi_lttng_element_event_field
;
93 extern const char * const mi_lttng_element_event_fields
;
95 /* String related to lttng_event_context */
96 extern const char * const mi_lttng_context_type_perf_counter
;
97 extern const char * const mi_lttng_context_type_perf_cpu_counter
;
98 extern const char * const mi_lttng_context_type_perf_thread_counter
;
100 /* String related to lttng_event_perf_counter_ctx */
101 extern const char * const mi_lttng_element_perf_counter_context
;
103 /* Strings related to pid */
104 extern const char * const mi_lttng_element_processes
;
105 extern const char * const mi_lttng_element_process
;
106 extern const char * const mi_lttng_element_pid_id
;
108 /* Strings related to save command */
109 extern const char * const mi_lttng_element_save
;
111 /* Strings related to load command */
112 extern const char * const mi_lttng_element_load
;
114 /* General element of mi_lttng */
115 extern const char * const mi_lttng_element_empty
;
116 extern const char * const mi_lttng_element_id
;
117 extern const char * const mi_lttng_element_nowrite
;
118 extern const char * const mi_lttng_element_success
;
119 extern const char * const mi_lttng_element_type_enum
;
120 extern const char * const mi_lttng_element_type_float
;
121 extern const char * const mi_lttng_element_type_integer
;
122 extern const char * const mi_lttng_element_type_other
;
123 extern const char * const mi_lttng_element_type_string
;
125 /* String related to loglevel */
126 extern const char * const mi_lttng_loglevel_str_alert
;
127 extern const char * const mi_lttng_loglevel_str_crit
;
128 extern const char * const mi_lttng_loglevel_str_debug
;
129 extern const char * const mi_lttng_loglevel_str_debug_function
;
130 extern const char * const mi_lttng_loglevel_str_debug_line
;
131 extern const char * const mi_lttng_loglevel_str_debug_module
;
132 extern const char * const mi_lttng_loglevel_str_debug_process
;
133 extern const char * const mi_lttng_loglevel_str_debug_program
;
134 extern const char * const mi_lttng_loglevel_str_debug_system
;
135 extern const char * const mi_lttng_loglevel_str_debug_unit
;
136 extern const char * const mi_lttng_loglevel_str_emerg
;
137 extern const char * const mi_lttng_loglevel_str_err
;
138 extern const char * const mi_lttng_loglevel_str_info
;
139 extern const char * const mi_lttng_loglevel_str_notice
;
140 extern const char * const mi_lttng_loglevel_str_unknown
;
141 extern const char * const mi_lttng_loglevel_str_warning
;
143 /* String related to loglevel JUL */
144 extern const char * const mi_lttng_loglevel_str_jul_all
;
145 extern const char * const mi_lttng_loglevel_str_jul_config
;
146 extern const char * const mi_lttng_loglevel_str_jul_fine
;
147 extern const char * const mi_lttng_loglevel_str_jul_finer
;
148 extern const char * const mi_lttng_loglevel_str_jul_finest
;
149 extern const char * const mi_lttng_loglevel_str_jul_info
;
150 extern const char * const mi_lttng_loglevel_str_jul_off
;
151 extern const char * const mi_lttng_loglevel_str_jul_severe
;
152 extern const char * const mi_lttng_loglevel_str_jul_warning
;
154 /* String related to loglevel Log4j */
155 extern const char * const mi_lttng_loglevel_str_log4j_off
;
156 extern const char * const mi_lttng_loglevel_str_log4j_fatal
;
157 extern const char * const mi_lttng_loglevel_str_log4j_error
;
158 extern const char * const mi_lttng_loglevel_str_log4j_warn
;
159 extern const char * const mi_lttng_loglevel_str_log4j_info
;
160 extern const char * const mi_lttng_loglevel_str_log4j_debug
;
161 extern const char * const mi_lttng_loglevel_str_log4j_trace
;
162 extern const char * const mi_lttng_loglevel_str_log4j_all
;
164 /* String related to loglevel Python */
165 extern const char * const mi_lttng_loglevel_str_python_critical
;
166 extern const char * const mi_lttng_loglevel_str_python_error
;
167 extern const char * const mi_lttng_loglevel_str_python_warning
;
168 extern const char * const mi_lttng_loglevel_str_python_info
;
169 extern const char * const mi_lttng_loglevel_str_python_debug
;
170 extern const char * const mi_lttng_loglevel_str_python_notset
;
172 /* String related to loglevel type */
173 extern const char * const mi_lttng_loglevel_type_all
;
174 extern const char * const mi_lttng_loglevel_type_range
;
175 extern const char * const mi_lttng_loglevel_type_single
;
176 extern const char * const mi_lttng_loglevel_type_unknown
;
178 /* Sting related to lttng_calibrate */
179 extern const char * const mi_lttng_element_calibrate
;
180 extern const char * const mi_lttng_element_calibrate_function
;
182 /* String related to a lttng_snapshot */
183 extern const char * const mi_lttng_element_snapshot_ctrl_url
;
184 extern const char * const mi_lttng_element_snapshot_data_url
;
185 extern const char * const mi_lttng_element_snapshot_max_size
;
186 extern const char * const mi_lttng_element_snapshot_n_ptr
;
187 extern const char * const mi_lttng_element_snapshot_session_name
;
188 extern const char * const mi_lttng_element_snapshots
;
190 /* Utility string function */
191 const char *mi_lttng_loglevel_string(int value
, enum lttng_domain_type domain
);
192 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value
);
193 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type value
);
194 const char *mi_lttng_domaintype_string(enum lttng_domain_type value
);
195 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value
);
196 const char *mi_lttng_calibratetype_string(enum lttng_calibrate_type val
);
198 /* String related to track/untrack command */
199 const char * const mi_lttng_element_track_untrack_all_wildcard
;
202 * Create an instance of a machine interface writer.
204 * fd_output File to which the XML content must be written. The file will be
205 * closed once the mi_writer has been destroyed.
207 * Returns an instance of a machine interface writer on success, NULL on
210 struct mi_writer
*mi_lttng_writer_create(int fd_output
, int mi_output_type
);
213 * Destroy an instance of a machine interface writer.
215 * writer An instance of a machine interface writer.
217 * Returns zero if the XML document could be closed cleanly. Negative values
220 int mi_lttng_writer_destroy(struct mi_writer
*writer
);
223 * Open a command tag and add it's name node.
225 * writer An instance of a machine interface writer.
226 * command The command name.
228 * Returns zero if the XML document could be closed cleanly.
229 * Negative values indicate an error.
231 int mi_lttng_writer_command_open(struct mi_writer
*writer
, const char *command
);
234 * Close a command tag.
236 * writer An instance of a machine interface writer.
238 * Returns zero if the XML document could be closed cleanly.
239 * Negative values indicate an error.
241 int mi_lttng_writer_command_close(struct mi_writer
*writer
);
244 * Open an element tag.
246 * writer An instance of a machine interface writer.
247 * element_name Element tag name.
249 * Returns zero if the XML document could be closed cleanly.
250 * Negative values indicate an error.
252 int mi_lttng_writer_open_element(struct mi_writer
*writer
,
253 const char *element_name
);
256 * Close the current element tag.
258 * writer An instance of a machine interface writer.
260 * Returns zero if the XML document could be closed cleanly.
261 * Negative values indicate an error.
263 int mi_lttng_writer_close_element(struct mi_writer
*writer
);
266 * Close multiple element.
268 * writer An instance of a machine interface writer.
269 * nb_element Number of elements.
271 * Returns zero if the XML document could be closed cleanly.
272 * Negative values indicate an error.
274 int mi_lttng_close_multi_element(struct mi_writer
*writer
,
275 unsigned int nb_element
);
278 * Write an element of type unsigned int.
280 * writer An instance of a machine interface writer.
281 * element_name Element name.
282 * value Unsigned int value of the element
284 * Returns zero if the element's value could be written.
285 * Negative values indicate an error.
287 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer
*writer
,
288 const char *element_name
, uint64_t value
);
291 * Write an element of type signed int.
293 * writer An instance of a machine interface writer.
294 * element_name Element name.
295 * value Signed int value of the element.
297 * Returns zero if the element's value could be written.
298 * Negative values indicate an error.
300 int mi_lttng_writer_write_element_signed_int(struct mi_writer
*writer
,
301 const char *element_name
, int64_t value
);
304 * Write an element of type boolean.
306 * writer An instance of a machine interface writer.
307 * element_name Element name.
308 * value Boolean value of the element.
310 * Returns zero if the element's value could be written.
311 * Negative values indicate an error.
313 int mi_lttng_writer_write_element_bool(struct mi_writer
*writer
,
314 const char *element_name
, int value
);
317 * Write an element of type string.
319 * writer An instance of a machine interface writer.
320 * element_name Element name.
321 * value String value of the element.
323 * Returns zero if the element's value could be written.
324 * Negative values indicate an error.
326 int mi_lttng_writer_write_element_string(struct mi_writer
*writer
,
327 const char *element_name
, const char *value
);
330 * Machine interface of struct version.
332 * writer An instance of a machine interface writer.
333 * version Version struct.
334 * lttng_description String value of the version description.
335 * lttng_license String value of the version license.
337 * Returns zero if the element's value could be written.
338 * Negative values indicate an error.
340 int mi_lttng_version(struct mi_writer
*writer
, struct mi_lttng_version
*version
,
341 const char *lttng_description
, const char *lttng_license
);
344 * Machine interface: open a sessions element.
346 * writer An instance of a machine interface writer.
348 * Returns zero if the element's value could be written.
349 * Negative values indicate an error.
351 int mi_lttng_sessions_open(struct mi_writer
*writer
);
354 * Machine interface of struct session.
356 * writer An instance of a machine interface writer.
357 * session An instance of a session.
358 * is_open Defines whether or not the session element shall be closed.
359 * This should be used carefully and the client
360 * must close the session element.
361 * Use case: nested additional information on a session
362 * ex: domain,channel event.
364 * Returns zero if the element's value could be written.
365 * Negative values indicate an error.
367 int mi_lttng_session(struct mi_writer
*writer
,
368 struct lttng_session
*session
, int is_open
);
371 * Machine interface: open a domains element.
373 * writer An instance of a machine interface writer.
375 * Returns zero if the element's value could be written.
376 * Negative values indicate an error.
378 int mi_lttng_domains_open(struct mi_writer
*writer
);
381 * Machine interface of struct domain.
383 * writer An instance of a machine interface writer.
384 * domain An instance of a domain.
386 * is_open Defines whether or not the session element shall be closed.
387 * This should be used carefully and the client
388 * must close the domain element.
389 * Use case: nested addition information on a domain
392 * Returns zero if the element's value could be written.
393 * Negative values indicate an error.
395 int mi_lttng_domain(struct mi_writer
*writer
,
396 struct lttng_domain
*domain
, int is_open
);
399 * Machine interface: open a channels element.
401 * writer An instance of a machine interface writer.
403 * Returns zero if the element's value could be written.
404 * Negative values indicate an error.
406 int mi_lttng_channels_open(struct mi_writer
*writer
);
409 * Machine interface of struct channel.
411 * writer An instance of a machine interface writer.
412 * channel An instance of a channel.
414 * is_open Defines whether or not the session element shall be closed.
415 * This should be used carefully and the client
416 * must close the channel element.
417 * Use case: nested addition information on a channel.
420 * Returns zero if the element's value could be written.
421 * Negative values indicate an error.
423 int mi_lttng_channel(struct mi_writer
*writer
,
424 struct lttng_channel
*channel
, int is_open
);
427 * Machine interface of struct channel_attr.
429 * writer An instance of a machine interface writer.
430 * attr An instance of a channel_attr struct.
432 * Returns zero if the element's value could be written.
433 * Negative values indicate an error.
435 int mi_lttng_channel_attr(struct mi_writer
*writer
,
436 struct lttng_channel_attr
*attr
);
439 * Machine interface for event common attributes.
441 * writer An instance of a mi writer.
442 * event single trace event.
444 * The common attribute are:
451 * Returns zero if the element's value could be written.
452 * Negative values indicate an error.
454 int mi_lttng_event_common_attributes(struct mi_writer
*writer
,
455 struct lttng_event
*event
);
458 * Machine interface for kernel tracepoint event with a loglevel.
460 * writer An instance of a mi writer.
461 * event single trace event.
462 * domain Event's domain
464 * Returns zero if the element's value could be written.
465 * Negative values indicate an error.
467 int mi_lttng_event_tracepoint_loglevel(struct mi_writer
*writer
,
468 struct lttng_event
*event
, enum lttng_domain_type domain
);
471 * Machine interface for kernel tracepoint event with no loglevel.
473 * writer An instance of a mi writer.
474 * event single trace event.
476 * Returns zero if the element's value could be written.
477 * Negative values indicate an error.
479 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer
*writer
,
480 struct lttng_event
*event
);
483 * Machine interface for kernel function and probe event.
485 * writer An instance of a mi writer.
486 * event single trace event.
488 * Returns zero if the element's value could be written.
489 * Negative values indicate an error.
491 int mi_lttng_event_function_probe(struct mi_writer
*writer
,
492 struct lttng_event
*event
);
495 * Machine interface for kernel function entry event.
497 * writer An instance of a mi writer.
498 * event single trace event.
500 * Returns zero if the element's value could be written.
501 * Negative values indicate an error.
503 int mi_lttng_event_function_entry(struct mi_writer
*writer
,
504 struct lttng_event
*event
);
507 * Machine interface: open an events element.
509 * writer An instance of a machine interface writer.
511 * Returns zero if the element's value could be written.
512 * Negative values indicate an error.
514 int mi_lttng_events_open(struct mi_writer
*writer
);
517 * Machine interface for printing an event.
518 * The trace event type currently supported are:
525 * writer An instance of a mi writer.
526 * event single trace event.
527 * is_open Defines whether or not the session element shall be closed.
528 * This should be used carefully and the client
529 * must close the event element.
530 * Use case: nested additional information
531 * domain Event's domain
533 * Returns zero if the element's value could be written.
534 * Negative values indicate an error.
536 int mi_lttng_event(struct mi_writer
*writer
, struct lttng_event
*event
,
537 int is_open
, enum lttng_domain_type domain
);
540 * Machine interface for struct lttng_event_field.
542 * writer An instance of a mi writer.
543 * field An event_field instance.
545 * Returns zero if the element's value could be written.
546 * Negative values indicate an error.
548 int mi_lttng_event_field(struct mi_writer
*writer
,
549 struct lttng_event_field
*field
);
552 * Machine interface: open a event_fields element.
554 * writer An instance of a machine interface writer.
556 * Returns zero if the element have be written.
557 * Negative values indicate an error.
559 int mi_lttng_event_fields_open(struct mi_writer
*writer
);
562 * Machine interface: open a trackers element.
564 * writer An instance of a machine interface writer.
566 * Returns zero if the element's value could be written.
567 * Negative values indicate an error.
569 int mi_lttng_trackers_open(struct mi_writer
*writer
);
572 * Machine interface: open a pid_tracker element.
574 * writer An instance of a machine interface writer.
576 * Returns zero if the element's value could be written.
577 * Negative values indicate an error.
579 * Note: A targets element is also opened for each tracker definition
581 int mi_lttng_pid_tracker_open(struct mi_writer
*writer
);
584 * Machine interface: open a PIDs element.
586 * writer An instance of a machine interface writer.
588 * Returns zero if the element's value could be written.
589 * Negative values indicate an error.
591 int mi_lttng_pids_open(struct mi_writer
*writer
);
594 * Machine interface: open a processes element.
596 * writer An instance of a machine interface writer.
598 * Returns zero if the element's value could be written.
599 * Negative values indicate an error.
601 int mi_lttng_processes_open(struct mi_writer
*writer
);
604 * Machine interface of a Process.
606 * writer An instance of a machine interface writer.
609 * is_open Defines whether or not the session element shall be closed.
610 * This should be used carefully and the client
611 * must close the pid element.
612 * Use case: nested addition information on a domain
615 * Returns zero if the element's value could be written.
616 * Negative values indicate an error.
618 int mi_lttng_process(struct mi_writer
*writer
, pid_t pid
, const char *name
,
621 * Machine interface: open a targets element.
623 * writer An instance of a machine interface writer.
625 * Returns zero if the element's value could be written.
626 * Negative values indicate an error.
628 int mi_lttng_targets_open(struct mi_writer
*writer
);
631 * Machine interface for track/untrack a pid_target
633 * writer An instance of a machine interface writer.
635 * Returns zero if the element's value could be written.
636 * Negative values indicate an error.
638 int mi_lttng_pid_target(struct mi_writer
*writer
, pid_t pid
, int is_open
);
641 * Machine interface for struct lttng_calibrate.
643 * writer An instance of a machine interface writer.
645 * calibrate A lttng_calibrate instance.
647 * Returns zero if the element's value could be written.
648 * Negative values indicate an error.
650 int mi_lttng_calibrate(struct mi_writer
*writer
,
651 struct lttng_calibrate
*calibrate
);
654 * Machine interface of a context.
656 * writer An instance of a machine interface writer
658 * context An instance of a lttng_event_context
660 * is_open Define if we close the context element
661 * This should be used carefully and the client
662 * need to close the context element.
663 * Returns zero if the element's value could be written.
664 * Negative values indicate an error.
666 int mi_lttng_context(struct mi_writer
*writer
,
667 struct lttng_event_context
*context
, int is_open
);
670 * Machine interface of a perf_counter_context.
672 * writer An instance of a machine interface writer
674 * contest An instance of a lttng_event_perf_counter_ctx
676 * Returns zero if the element's value could be written.
677 * Negative values indicate an error.
679 int mi_lttng_perf_counter_context(struct mi_writer
*writer
,
680 struct lttng_event_perf_counter_ctx
*perf_context
);
683 * Machine interface of the snapshot list_output.
684 * It specifies the session for which we are listing snapshots,
685 * and it opens a snapshots element to list a sequence
688 * writer An instance of a machine interface writer.
690 * session_name: Snapshot output for session "session_name".
692 * Note: The client has to close the session and the snapshots elements after
693 * having listed every lttng_snapshot_output.
695 * Returns zero if the element's value could be written.
696 * Negative values indicate an error.
698 int mi_lttng_snapshot_output_session_name(struct mi_writer
*writer
,
699 const char *session_name
);
702 * Machine interface of the snapshot output.
703 * The machine interface serializes the following attributes:
704 * - id: ID of the snapshot output.
705 * - name: Name of the output.
706 * - data_url : Destination of the output.
707 * - ctrl_url: Destination of the output.
708 * - max_size: total size of all stream combined.
710 * writer An instance of a machine interface writer.
712 * output: A list of snapshot_output.
714 * Returns zero if the element's value could be written.
715 * Negative values indicate an error.
717 int mi_lttng_snapshot_list_output(struct mi_writer
*writer
,
718 struct lttng_snapshot_output
*output
);
721 * Machine interface of the output of the command snapshot del output
722 * when deleting a snapshot either by id or by name.
723 * If the snapshot was found and successfully deleted using its id,
724 * it return the id of the snapshot and the current session name on which it
727 * Otherwise, it do the same process with the name of the snapshot, if the
728 * snapshot output id is undefined.
730 * writer An instance of a machine interface writer.
732 * id: ID of the snapshot output.
734 * name: Name of the snapshot.
736 * current_session_name: Session to which the snapshot belongs.
738 * Returns zero if the element's value could be written.
739 * Negative values indicate an error.
741 int mi_lttng_snapshot_del_output(struct mi_writer
*writer
, int id
,
742 const char *name
, const char *current_session_name
);
745 * Machine interface of the output of the command snapshot add output
746 * when adding a snapshot from a user URL.
748 * If the snapshot was successfully added, the machine interface lists
750 * - id: ID of the newly add snapshot output.
751 * - current_session_name: Name of the session to which the output was added.
752 * - ctrl_url: Destination of the output.
753 * - max_size: total size of all stream combined.
755 * writer An instance of a machine interface writer.
757 * current_session_name: Session to which the snapshot belongs.
761 * output: iterator over a lttng_snapshot_output_list which contain
762 * the snapshot output informations.
764 * Returns zero if the element's value could be written.
765 * Negative values indicate an error.
767 int mi_lttng_snapshot_add_output(struct mi_writer
*writer
,
768 const char *current_session_name
, const char *n_ptr
,
769 struct lttng_snapshot_output
*output
);
772 * Machine interface of the output of the command snapshot
773 * record from a URL (if given).
775 * If the snapshot is successfully recorded from a url, the machine interface
776 * output the following information:
777 * - url: Destination of the output stored in the snapshot.
779 * Otherwise, the machine interface output the data and ctrl url received
780 * from the command-line.
782 * writer An instance of a machine interface writer.
784 * current_session_name: Snapshot record for session "current_session_name".
786 * ctrl_url, data_url: Destination of the output receive from the command-line.
788 * Returns zero if the element's value could be written.
789 * Negative values indicate an error.
791 int mi_lttng_snapshot_record(struct mi_writer
*writer
,
792 const char *current_session_name
, const char *url
,
793 const char *cmdline_ctrl_url
, const char *cmdline_data_url
);
795 #endif /* _MI_LTTNG_H */