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1/*
2 * Copyright (C) 2014 - Jonathan Rajotte <jonathan.r.julien@gmail.com>
3 * - Olivier Cotte <olivier.cotte@polymtl.ca>
4 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License, version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20#ifndef _MI_LTTNG_H
21#define _MI_LTTNG_H
22
23#include <stdint.h>
24
25#include <common/error.h>
26#include <common/macros.h>
27#include <common/config/session-config.h>
28#include <lttng/lttng.h>
29
30/* Don't want to reference snapshot-internal.h here */
31struct lttng_snapshot_output;
32
33/* Instance of a machine interface writer. */
34struct mi_writer {
35 struct config_writer *writer;
36 enum lttng_mi_output_type type;
37};
38
39/*
40 * Version information for the machine interface.
41 */
42struct mi_lttng_version {
43 char version[LTTNG_NAME_MAX]; /* Version number of package */
44 uint32_t version_major; /* LTTng-Tools major version number */
45 uint32_t version_minor; /* LTTng-Tools minor version number */
46 uint32_t version_patchlevel; /* LTTng-Tools patchlevel version number */
47 char version_commit[LTTNG_NAME_MAX]; /* Commit hash of the current version */
48 char version_name[LTTNG_NAME_MAX];
49 char package_url[LTTNG_NAME_MAX]; /* Define to the home page for this package. */
50};
51
52/* Strings related to command */
53extern const char * const mi_lttng_element_command;
54extern const char * const mi_lttng_element_command_action;
55extern const char * const mi_lttng_element_command_add_context;
56extern const char * const mi_lttng_element_command_calibrate;
57extern const char * const mi_lttng_element_command_create;
58extern const char * const mi_lttng_element_command_destroy;
59extern const char * const mi_lttng_element_command_disable_channel;
60extern const char * const mi_lttng_element_command_disable_event;
61extern const char * const mi_lttng_element_command_enable_channels;
62extern const char * const mi_lttng_element_command_enable_event;
63extern const char * const mi_lttng_element_command_list;
64extern const char * const mi_lttng_element_command_load;
65extern const char * const mi_lttng_element_command_name;
66extern const char * const mi_lttng_element_command_output;
67extern const char * const mi_lttng_element_command_save;
68extern const char * const mi_lttng_element_command_set_session;
69extern const char * const mi_lttng_element_command_snapshot;
70extern const char * const mi_lttng_element_command_snapshot_add;
71extern const char * const mi_lttng_element_command_snapshot_del;
72extern const char * const mi_lttng_element_command_snapshot_list;
73extern const char * const mi_lttng_element_command_snapshot_record;
74extern const char * const mi_lttng_element_command_start;
75extern const char * const mi_lttng_element_command_stop;
76extern const char * const mi_lttng_element_command_success;
77extern const char * const mi_lttng_element_command_track;
78extern const char * const mi_lttng_element_command_untrack;
79extern const char * const mi_lttng_element_command_version;
80
81/* Strings related to version command */
82extern const char * const mi_lttng_element_version;
83extern const char * const mi_lttng_element_version_commit;
84extern const char * const mi_lttng_element_version_description;
85extern const char * const mi_lttng_element_version_license;
86extern const char * const mi_lttng_element_version_major;
87extern const char * const mi_lttng_element_version_minor;
88extern const char * const mi_lttng_element_version_patch_level;
89extern const char * const mi_lttng_element_version_str;
90extern const char * const mi_lttng_element_version_web;
91
92/* String related to a lttng_event_field */
93extern const char * const mi_lttng_element_event_field;
94extern const char * const mi_lttng_element_event_fields;
95
96/* String related to lttng_event_perf_counter_ctx */
97extern const char * const mi_lttng_element_perf_counter_context;
98
99/* Strings related to pid */
100extern const char * const mi_lttng_element_pid_id;
101
102/* Strings related to save command */
103extern const char * const mi_lttng_element_save;
104
105/* Strings related to load command */
106extern const char * const mi_lttng_element_load;
107
108/* General element of mi_lttng */
109extern const char * const mi_lttng_element_empty;
110extern const char * const mi_lttng_element_id;
111extern const char * const mi_lttng_element_nowrite;
112extern const char * const mi_lttng_element_success;
113extern const char * const mi_lttng_element_type_enum;
114extern const char * const mi_lttng_element_type_float;
115extern const char * const mi_lttng_element_type_integer;
116extern const char * const mi_lttng_element_type_other;
117extern const char * const mi_lttng_element_type_string;
118
119/* String related to loglevel */
120extern const char * const mi_lttng_loglevel_str_alert;
121extern const char * const mi_lttng_loglevel_str_crit;
122extern const char * const mi_lttng_loglevel_str_debug;
123extern const char * const mi_lttng_loglevel_str_debug_function;
124extern const char * const mi_lttng_loglevel_str_debug_line;
125extern const char * const mi_lttng_loglevel_str_debug_module;
126extern const char * const mi_lttng_loglevel_str_debug_process;
127extern const char * const mi_lttng_loglevel_str_debug_program;
128extern const char * const mi_lttng_loglevel_str_debug_system;
129extern const char * const mi_lttng_loglevel_str_debug_unit;
130extern const char * const mi_lttng_loglevel_str_emerg;
131extern const char * const mi_lttng_loglevel_str_err;
132extern const char * const mi_lttng_loglevel_str_info;
133extern const char * const mi_lttng_loglevel_str_notice;
134extern const char * const mi_lttng_loglevel_str_unknown;
135extern const char * const mi_lttng_loglevel_str_warning;
136
137/* String related to loglevel JUL */
138extern const char * const mi_lttng_loglevel_str_jul_all;
139extern const char * const mi_lttng_loglevel_str_jul_config;
140extern const char * const mi_lttng_loglevel_str_jul_fine;
141extern const char * const mi_lttng_loglevel_str_jul_finer;
142extern const char * const mi_lttng_loglevel_str_jul_finest;
143extern const char * const mi_lttng_loglevel_str_jul_info;
144extern const char * const mi_lttng_loglevel_str_jul_off;
145extern const char * const mi_lttng_loglevel_str_jul_severe;
146extern const char * const mi_lttng_loglevel_str_jul_warning;
147
148/* String related to loglevel Log4j */
149extern const char * const mi_lttng_loglevel_str_log4j_off;
150extern const char * const mi_lttng_loglevel_str_log4j_fatal;
151extern const char * const mi_lttng_loglevel_str_log4j_error;
152extern const char * const mi_lttng_loglevel_str_log4j_warn;
153extern const char * const mi_lttng_loglevel_str_log4j_info;
154extern const char * const mi_lttng_loglevel_str_log4j_debug;
155extern const char * const mi_lttng_loglevel_str_log4j_trace;
156extern const char * const mi_lttng_loglevel_str_log4j_all;
157
158/* String related to loglevel Python */
159extern const char * const mi_lttng_loglevel_str_python_critical;
160extern const char * const mi_lttng_loglevel_str_python_error;
161extern const char * const mi_lttng_loglevel_str_python_warning;
162extern const char * const mi_lttng_loglevel_str_python_info;
163extern const char * const mi_lttng_loglevel_str_python_debug;
164extern const char * const mi_lttng_loglevel_str_python_notset;
165
166/* String related to loglevel type */
167extern const char * const mi_lttng_loglevel_type_all;
168extern const char * const mi_lttng_loglevel_type_range;
169extern const char * const mi_lttng_loglevel_type_single;
170extern const char * const mi_lttng_loglevel_type_unknown;
171
172/* Sting related to lttng_calibrate */
173extern const char * const mi_lttng_element_calibrate;
174extern const char * const mi_lttng_element_calibrate_function;
175
176/* String related to a lttng_snapshot */
177extern const char * const mi_lttng_element_snapshot_ctrl_url;
178extern const char * const mi_lttng_element_snapshot_data_url;
179extern const char * const mi_lttng_element_snapshot_max_size;
180extern const char * const mi_lttng_element_snapshot_n_ptr;
181extern const char * const mi_lttng_element_snapshot_session_name;
182extern const char * const mi_lttng_element_snapshots;
183
184/* String related to track/untrack command */
185const char * const mi_lttng_element_track_untrack_all_wildcard;
186
187/* Utility string function */
188const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain);
189const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value);
190const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type value);
191const char *mi_lttng_domaintype_string(enum lttng_domain_type value);
192const char *mi_lttng_buffertype_string(enum lttng_buffer_type value);
193const char *mi_lttng_calibratetype_string(enum lttng_calibrate_type val);
194
195/*
196 * Create an instance of a machine interface writer.
197 *
198 * fd_output File to which the XML content must be written. The file will be
199 * closed once the mi_writer has been destroyed.
200 *
201 * Returns an instance of a machine interface writer on success, NULL on
202 * error.
203 */
204struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type);
205
206/*
207 * Destroy an instance of a machine interface writer.
208 *
209 * writer An instance of a machine interface writer.
210 *
211 * Returns zero if the XML document could be closed cleanly. Negative values
212 * indicate an error.
213 */
214int mi_lttng_writer_destroy(struct mi_writer *writer);
215
216/*
217 * Open a command tag and add it's name node.
218 *
219 * writer An instance of a machine interface writer.
220 * command The command name.
221 *
222 * Returns zero if the XML document could be closed cleanly.
223 * Negative values indicate an error.
224 */
225int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command);
226
227/*
228 * Close a command tag.
229 *
230 * writer An instance of a machine interface writer.
231 *
232 * Returns zero if the XML document could be closed cleanly.
233 * Negative values indicate an error.
234 */
235int mi_lttng_writer_command_close(struct mi_writer *writer);
236
237/*
238 * Open an element tag.
239 *
240 * writer An instance of a machine interface writer.
241 * element_name Element tag name.
242 *
243 * Returns zero if the XML document could be closed cleanly.
244 * Negative values indicate an error.
245 */
246int mi_lttng_writer_open_element(struct mi_writer *writer,
247 const char *element_name);
248
249/*
250 * Close the current element tag.
251 *
252 * writer An instance of a machine interface writer.
253 *
254 * Returns zero if the XML document could be closed cleanly.
255 * Negative values indicate an error.
256 */
257int mi_lttng_writer_close_element(struct mi_writer *writer);
258
259/*
260 * Close multiple element.
261 *
262 * writer An instance of a machine interface writer.
263 * nb_element Number of elements.
264 *
265 * Returns zero if the XML document could be closed cleanly.
266 * Negative values indicate an error.
267 */
268int mi_lttng_close_multi_element(struct mi_writer *writer,
269 unsigned int nb_element);
270
271/*
272 * Write an element of type unsigned int.
273 *
274 * writer An instance of a machine interface writer.
275 * element_name Element name.
276 * value Unsigned int value of the element
277 *
278 * Returns zero if the element's value could be written.
279 * Negative values indicate an error.
280 */
281int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
282 const char *element_name, uint64_t value);
283
284/*
285 * Write an element of type signed int.
286 *
287 * writer An instance of a machine interface writer.
288 * element_name Element name.
289 * value Signed int value of the element.
290 *
291 * Returns zero if the element's value could be written.
292 * Negative values indicate an error.
293 */
294int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
295 const char *element_name, int64_t value);
296
297/*
298 * Write an element of type boolean.
299 *
300 * writer An instance of a machine interface writer.
301 * element_name Element name.
302 * value Boolean value of the element.
303 *
304 * Returns zero if the element's value could be written.
305 * Negative values indicate an error.
306 */
307int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
308 const char *element_name, int value);
309
310/*
311 * Write an element of type string.
312 *
313 * writer An instance of a machine interface writer.
314 * element_name Element name.
315 * value String value of the element.
316 *
317 * Returns zero if the element's value could be written.
318 * Negative values indicate an error.
319 */
320int mi_lttng_writer_write_element_string(struct mi_writer *writer,
321 const char *element_name, const char *value);
322
323/*
324 * Machine interface of struct version.
325 *
326 * writer An instance of a machine interface writer.
327 * version Version struct.
328 * lttng_description String value of the version description.
329 * lttng_license String value of the version license.
330 *
331 * Returns zero if the element's value could be written.
332 * Negative values indicate an error.
333 */
334int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
335 const char *lttng_description, const char *lttng_license);
336
337/*
338 * Machine interface: open a sessions element.
339 *
340 * writer An instance of a machine interface writer.
341 *
342 * Returns zero if the element's value could be written.
343 * Negative values indicate an error.
344 */
345int mi_lttng_sessions_open(struct mi_writer *writer);
346
347/*
348 * Machine interface of struct session.
349 *
350 * writer An instance of a machine interface writer.
351 * session An instance of a session.
352 * is_open Defines whether or not the session element shall be closed.
353 * This should be used carefully and the client
354 * must close the session element.
355 * Use case: nested additional information on a session
356 * ex: domain,channel event.
357 *
358 * Returns zero if the element's value could be written.
359 * Negative values indicate an error.
360 */
361int mi_lttng_session(struct mi_writer *writer,
362 struct lttng_session *session, int is_open);
363
364/*
365 * Machine interface: open a domains element.
366 *
367 * writer An instance of a machine interface writer.
368 *
369 * Returns zero if the element's value could be written.
370 * Negative values indicate an error.
371 */
372int mi_lttng_domains_open(struct mi_writer *writer);
373
374/*
375 * Machine interface of struct domain.
376 *
377 * writer An instance of a machine interface writer.
378 * domain An instance of a domain.
379 *
380 * is_open Defines whether or not the session element shall be closed.
381 * This should be used carefully and the client
382 * must close the domain element.
383 * Use case: nested addition information on a domain
384 * ex: channel event.
385 *
386 * Returns zero if the element's value could be written.
387 * Negative values indicate an error.
388 */
389int mi_lttng_domain(struct mi_writer *writer,
390 struct lttng_domain *domain, int is_open);
391
392/*
393 * Machine interface: open a channels element.
394 *
395 * writer An instance of a machine interface writer.
396 *
397 * Returns zero if the element's value could be written.
398 * Negative values indicate an error.
399 */
400int mi_lttng_channels_open(struct mi_writer *writer);
401
402/*
403 * Machine interface of struct channel.
404 *
405 * writer An instance of a machine interface writer.
406 * channel An instance of a channel.
407 *
408 * is_open Defines whether or not the session element shall be closed.
409 * This should be used carefully and the client
410 * must close the channel element.
411 * Use case: nested addition information on a channel.
412 * ex: channel event.
413 *
414 * Returns zero if the element's value could be written.
415 * Negative values indicate an error.
416 */
417int mi_lttng_channel(struct mi_writer *writer,
418 struct lttng_channel *channel, int is_open);
419
420/*
421 * Machine interface of struct channel_attr.
422 *
423 * writer An instance of a machine interface writer.
424 * attr An instance of a channel_attr struct.
425 *
426 * Returns zero if the element's value could be written.
427 * Negative values indicate an error.
428 */
429int mi_lttng_channel_attr(struct mi_writer *writer,
430 struct lttng_channel_attr *attr);
431
432/*
433* Machine interface for event common attributes.
434*
435* writer An instance of a mi writer.
436* event single trace event.
437*
438* The common attribute are:
439* - mi event element
440* - event name
441* - event type
442* - enabled tag
443* - event filter
444*
445* Returns zero if the element's value could be written.
446* Negative values indicate an error.
447*/
448int mi_lttng_event_common_attributes(struct mi_writer *writer,
449 struct lttng_event *event);
450
451/*
452 * Machine interface for kernel tracepoint event with a loglevel.
453 *
454 * writer An instance of a mi writer.
455 * event single trace event.
456 * domain Event's domain
457 *
458 * Returns zero if the element's value could be written.
459 * Negative values indicate an error.
460 */
461int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
462 struct lttng_event *event, enum lttng_domain_type domain);
463
464/*
465 * Machine interface for kernel tracepoint event with no loglevel.
466 *
467 * writer An instance of a mi writer.
468 * event single trace event.
469 *
470 * Returns zero if the element's value could be written.
471 * Negative values indicate an error.
472 */
473int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
474 struct lttng_event *event);
475
476/*
477 * Machine interface for kernel function and probe event.
478 *
479 * writer An instance of a mi writer.
480 * event single trace event.
481 *
482 * Returns zero if the element's value could be written.
483 * Negative values indicate an error.
484 */
485int mi_lttng_event_function_probe(struct mi_writer *writer,
486 struct lttng_event *event);
487
488/*
489 * Machine interface for kernel function entry event.
490 *
491 * writer An instance of a mi writer.
492 * event single trace event.
493 *
494 * Returns zero if the element's value could be written.
495 * Negative values indicate an error.
496 */
497int mi_lttng_event_function_entry(struct mi_writer *writer,
498 struct lttng_event *event);
499
500/*
501 * Machine interface: open an events element.
502 *
503 * writer An instance of a machine interface writer.
504 *
505 * Returns zero if the element's value could be written.
506 * Negative values indicate an error.
507 */
508int mi_lttng_events_open(struct mi_writer *writer);
509
510/*
511 * Machine interface for printing an event.
512 * The trace event type currently supported are:
513 * TRACEPOINT,
514 * PROBE,
515 * FUNCTION,
516 * FUNCTION_ENTRY,
517 * SYSCALL
518 *
519 * writer An instance of a mi writer.
520 * event single trace event.
521 * is_open Defines whether or not the session element shall be closed.
522 * This should be used carefully and the client
523 * must close the event element.
524 * Use case: nested additional information
525 * domain Event's domain
526 *
527 * Returns zero if the element's value could be written.
528 * Negative values indicate an error.
529 */
530int mi_lttng_event(struct mi_writer *writer, struct lttng_event *event,
531 int is_open, enum lttng_domain_type domain);
532
533/*
534 * Machine interface for struct lttng_event_field.
535 *
536 * writer An instance of a mi writer.
537 * field An event_field instance.
538 *
539 * Returns zero if the element's value could be written.
540 * Negative values indicate an error.
541 */
542int mi_lttng_event_field(struct mi_writer *writer,
543 struct lttng_event_field *field);
544
545/*
546 * Machine interface: open a event_fields element.
547 *
548 * writer An instance of a machine interface writer.
549 *
550 * Returns zero if the element have be written.
551 * Negative values indicate an error.
552 */
553int mi_lttng_event_fields_open(struct mi_writer *writer);
554
555/*
556 * Machine interface: open a trackers element.
557 *
558 * writer An instance of a machine interface writer.
559 *
560 * Returns zero if the element's value could be written.
561 * Negative values indicate an error.
562 */
563int mi_lttng_trackers_open(struct mi_writer *writer);
564
565/*
566 * Machine interface: open a pid_tracker element.
567 *
568 * writer An instance of a machine interface writer.
569 *
570 * Returns zero if the element's value could be written.
571 * Negative values indicate an error.
572 *
573 * Note: A targets element is also opened for each tracker definition
574 */
575int mi_lttng_pid_tracker_open(struct mi_writer *writer);
576
577/*
578 * Machine interface: open a PIDs element.
579 *
580 * writer An instance of a machine interface writer.
581 *
582 * Returns zero if the element's value could be written.
583 * Negative values indicate an error.
584 */
585int mi_lttng_pids_open(struct mi_writer *writer);
586
587/*
588 * Machine interface: open a processes element.
589 *
590 * writer An instance of a machine interface writer.
591 *
592 * Returns zero if the element's value could be written.
593 * Negative values indicate an error.
594 */
595int mi_lttng_processes_open(struct mi_writer *writer);
596
597/*
598 * Machine interface of a Process.
599 *
600 * writer An instance of a machine interface writer.
601 * pid A PID.
602 *
603 * is_open Defines whether or not the session element shall be closed.
604 * This should be used carefully and the client
605 * must close the pid element.
606 * Use case: nested addition information on a domain
607 * ex: channel event.
608 *
609 * Returns zero if the element's value could be written.
610 * Negative values indicate an error.
611 */
612int mi_lttng_process(struct mi_writer *writer, pid_t pid , const char *name,
613 int is_open);
614
615/*
616 * TODO: move pid of lttng list -u to process semantic on mi api bump
617 * Machine interface of a Process.
618 *
619 * writer An instance of a machine interface writer.
620 * pid A PID.
621 *
622 * is_open Defines whether or not the session element shall be closed.
623 * This should be used carefully and the client
624 * must close the pid element.
625 * Use case: nested addition information on a domain
626 * ex: channel event.
627 *
628 * Returns zero if the element's value could be written.
629 * Negative values indicate an error.
630 */
631int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *name,
632 int is_open);
633/*
634 * Machine interface: open a targets element.
635 *
636 * writer An instance of a machine interface writer.
637 *
638 * Returns zero if the element's value could be written.
639 * Negative values indicate an error.
640 */
641int mi_lttng_targets_open(struct mi_writer *writer);
642
643/*
644 * Machine interface for track/untrack a pid_target
645 *
646 * writer An instance of a machine interface writer.
647 *
648 * Returns zero if the element's value could be written.
649 * Negative values indicate an error.
650 */
651int mi_lttng_pid_target(struct mi_writer *writer, pid_t pid, int is_open);
652
653/*
654 * Machine interface for struct lttng_calibrate.
655 *
656 * writer An instance of a machine interface writer.
657 *
658 * calibrate A lttng_calibrate instance.
659 *
660 * Returns zero if the element's value could be written.
661 * Negative values indicate an error.
662 */
663int mi_lttng_calibrate(struct mi_writer *writer,
664 struct lttng_calibrate *calibrate);
665
666/*
667 * Machine interface of a context.
668 *
669 * writer An instance of a machine interface writer
670 *
671 * context An instance of a lttng_event_context
672 *
673 * is_open Define if we close the context element
674 * This should be used carefully and the client
675 * need to close the context element.
676 * Returns zero if the element's value could be written.
677 * Negative values indicate an error.
678 */
679int mi_lttng_context(struct mi_writer *writer,
680 struct lttng_event_context *context, int is_open);
681
682/*
683 * Machine interface of a perf_counter_context.
684 *
685 * writer An instance of a machine interface writer
686 *
687 * contest An instance of a lttng_event_perf_counter_ctx
688 *
689 * Returns zero if the element's value could be written.
690 * Negative values indicate an error.
691 */
692int mi_lttng_perf_counter_context(struct mi_writer *writer,
693 struct lttng_event_perf_counter_ctx *perf_context);
694
695/*
696 * Machine interface of the snapshot list_output.
697 * It specifies the session for which we are listing snapshots,
698 * and it opens a snapshots element to list a sequence
699 * of snapshots.
700 *
701 * writer An instance of a machine interface writer.
702 *
703 * session_name: Snapshot output for session "session_name".
704 *
705 * Note: The client has to close the session and the snapshots elements after
706 * having listed every lttng_snapshot_output.
707 *
708 * Returns zero if the element's value could be written.
709 * Negative values indicate an error.
710 */
711int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
712 const char *session_name);
713
714/*
715 * Machine interface of the snapshot output.
716 * The machine interface serializes the following attributes:
717 * - id: ID of the snapshot output.
718 * - name: Name of the output.
719 * - data_url : Destination of the output.
720 * - ctrl_url: Destination of the output.
721 * - max_size: total size of all stream combined.
722 *
723 * writer An instance of a machine interface writer.
724 *
725 * output: A list of snapshot_output.
726 *
727 * Returns zero if the element's value could be written.
728 * Negative values indicate an error.
729 */
730int mi_lttng_snapshot_list_output(struct mi_writer *writer,
731 struct lttng_snapshot_output *output);
732
733/*
734 * Machine interface of the output of the command snapshot del output
735 * when deleting a snapshot either by id or by name.
736 * If the snapshot was found and successfully deleted using its id,
737 * it return the id of the snapshot and the current session name on which it
738 * was attached.
739 *
740 * Otherwise, it do the same process with the name of the snapshot, if the
741 * snapshot output id is undefined.
742 *
743 * writer An instance of a machine interface writer.
744 *
745 * id: ID of the snapshot output.
746 *
747 * name: Name of the snapshot.
748 *
749 * current_session_name: Session to which the snapshot belongs.
750 *
751 * Returns zero if the element's value could be written.
752 * Negative values indicate an error.
753 */
754int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
755 const char *name, const char *current_session_name);
756
757/*
758 * Machine interface of the output of the command snapshot add output
759 * when adding a snapshot from a user URL.
760 *
761 * If the snapshot was successfully added, the machine interface lists
762 * these information:
763 * - id: ID of the newly add snapshot output.
764 * - current_session_name: Name of the session to which the output was added.
765 * - ctrl_url: Destination of the output.
766 * - max_size: total size of all stream combined.
767 *
768 * writer An instance of a machine interface writer.
769 *
770 * current_session_name: Session to which the snapshot belongs.
771 *
772 * n_ptr:
773 *
774 * output: iterator over a lttng_snapshot_output_list which contain
775 * the snapshot output informations.
776 *
777 * Returns zero if the element's value could be written.
778 * Negative values indicate an error.
779 */
780int mi_lttng_snapshot_add_output(struct mi_writer *writer,
781 const char *current_session_name, const char *n_ptr,
782 struct lttng_snapshot_output *output);
783
784/*
785 * Machine interface of the output of the command snapshot
786 * record from a URL (if given).
787 *
788 * If the snapshot is successfully recorded from a url, the machine interface
789 * output the following information:
790 * - url: Destination of the output stored in the snapshot.
791 *
792 * Otherwise, the machine interface output the data and ctrl url received
793 * from the command-line.
794 *
795 * writer An instance of a machine interface writer.
796 *
797 * current_session_name: Snapshot record for session "current_session_name".
798 *
799 * ctrl_url, data_url: Destination of the output receive from the command-line.
800 *
801 * Returns zero if the element's value could be written.
802 * Negative values indicate an error.
803 */
804int mi_lttng_snapshot_record(struct mi_writer *writer,
805 const char *current_session_name, const char *url,
806 const char *cmdline_ctrl_url, const char *cmdline_data_url);
807
808#endif /* _MI_LTTNG_H */
LTTng 2.0 tools and control repository
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