Fix: race between kconsumerd and sessiond on tear down
[lttng-tools.git] / src / common / mi-lttng.h
1 /*
2 * Copyright (C) 2014 - Jonathan Rajotte <jonathan.r.julien@gmail.com>
3 * - Olivier Cotte <olivier.cotte@polymtl.ca>
4 *
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.
8 *
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
12 * more details.
13 *
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.
17 */
18
19 #ifndef _MI_LTTNG_H
20 #define _MI_LTTNG_H
21
22 #include <stdint.h>
23
24 #include <common/error.h>
25 #include <common/macros.h>
26 #include <common/config/config.h>
27 #include <lttng/lttng.h>
28
29 /* Don't want to reference snapshot-internal.h here */
30 struct lttng_snapshot_output;
31
32 /* Instance of a machine interface writer. */
33 struct mi_writer {
34 struct config_writer *writer;
35 enum lttng_mi_output_type type;
36 };
37
38 /*
39 * Version information for the machine interface.
40 */
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. */
49 };
50
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;
79
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;
90
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;
94
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;
99
100 /* String related to lttng_event_perf_counter_ctx */
101 extern const char * const mi_lttng_element_perf_counter_context;
102
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;
107
108 /* Strings related to save command */
109 extern const char * const mi_lttng_element_save;
110
111 /* Strings related to load command */
112 extern const char * const mi_lttng_element_load;
113
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;
124
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;
142
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;
153
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;
163
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;
171
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;
177
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;
181
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;
189
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);
197
198 /* String related to track/untrack command */
199 const char * const mi_lttng_element_track_untrack_all_wildcard;
200
201 /*
202 * Create an instance of a machine interface writer.
203 *
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.
206 *
207 * Returns an instance of a machine interface writer on success, NULL on
208 * error.
209 */
210 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type);
211
212 /*
213 * Destroy an instance of a machine interface writer.
214 *
215 * writer An instance of a machine interface writer.
216 *
217 * Returns zero if the XML document could be closed cleanly. Negative values
218 * indicate an error.
219 */
220 int mi_lttng_writer_destroy(struct mi_writer *writer);
221
222 /*
223 * Open a command tag and add it's name node.
224 *
225 * writer An instance of a machine interface writer.
226 * command The command name.
227 *
228 * Returns zero if the XML document could be closed cleanly.
229 * Negative values indicate an error.
230 */
231 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command);
232
233 /*
234 * Close a command tag.
235 *
236 * writer An instance of a machine interface writer.
237 *
238 * Returns zero if the XML document could be closed cleanly.
239 * Negative values indicate an error.
240 */
241 int mi_lttng_writer_command_close(struct mi_writer *writer);
242
243 /*
244 * Open an element tag.
245 *
246 * writer An instance of a machine interface writer.
247 * element_name Element tag name.
248 *
249 * Returns zero if the XML document could be closed cleanly.
250 * Negative values indicate an error.
251 */
252 int mi_lttng_writer_open_element(struct mi_writer *writer,
253 const char *element_name);
254
255 /*
256 * Close the current element tag.
257 *
258 * writer An instance of a machine interface writer.
259 *
260 * Returns zero if the XML document could be closed cleanly.
261 * Negative values indicate an error.
262 */
263 int mi_lttng_writer_close_element(struct mi_writer *writer);
264
265 /*
266 * Close multiple element.
267 *
268 * writer An instance of a machine interface writer.
269 * nb_element Number of elements.
270 *
271 * Returns zero if the XML document could be closed cleanly.
272 * Negative values indicate an error.
273 */
274 int mi_lttng_close_multi_element(struct mi_writer *writer,
275 unsigned int nb_element);
276
277 /*
278 * Write an element of type unsigned int.
279 *
280 * writer An instance of a machine interface writer.
281 * element_name Element name.
282 * value Unsigned int value of the element
283 *
284 * Returns zero if the element's value could be written.
285 * Negative values indicate an error.
286 */
287 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
288 const char *element_name, uint64_t value);
289
290 /*
291 * Write an element of type signed int.
292 *
293 * writer An instance of a machine interface writer.
294 * element_name Element name.
295 * value Signed int value of the element.
296 *
297 * Returns zero if the element's value could be written.
298 * Negative values indicate an error.
299 */
300 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
301 const char *element_name, int64_t value);
302
303 /*
304 * Write an element of type boolean.
305 *
306 * writer An instance of a machine interface writer.
307 * element_name Element name.
308 * value Boolean value of the element.
309 *
310 * Returns zero if the element's value could be written.
311 * Negative values indicate an error.
312 */
313 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
314 const char *element_name, int value);
315
316 /*
317 * Write an element of type string.
318 *
319 * writer An instance of a machine interface writer.
320 * element_name Element name.
321 * value String value of the element.
322 *
323 * Returns zero if the element's value could be written.
324 * Negative values indicate an error.
325 */
326 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
327 const char *element_name, const char *value);
328
329 /*
330 * Machine interface of struct version.
331 *
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.
336 *
337 * Returns zero if the element's value could be written.
338 * Negative values indicate an error.
339 */
340 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
341 const char *lttng_description, const char *lttng_license);
342
343 /*
344 * Machine interface: open a sessions element.
345 *
346 * writer An instance of a machine interface writer.
347 *
348 * Returns zero if the element's value could be written.
349 * Negative values indicate an error.
350 */
351 int mi_lttng_sessions_open(struct mi_writer *writer);
352
353 /*
354 * Machine interface of struct session.
355 *
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.
363 *
364 * Returns zero if the element's value could be written.
365 * Negative values indicate an error.
366 */
367 int mi_lttng_session(struct mi_writer *writer,
368 struct lttng_session *session, int is_open);
369
370 /*
371 * Machine interface: open a domains element.
372 *
373 * writer An instance of a machine interface writer.
374 *
375 * Returns zero if the element's value could be written.
376 * Negative values indicate an error.
377 */
378 int mi_lttng_domains_open(struct mi_writer *writer);
379
380 /*
381 * Machine interface of struct domain.
382 *
383 * writer An instance of a machine interface writer.
384 * domain An instance of a domain.
385 *
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
390 * ex: channel event.
391 *
392 * Returns zero if the element's value could be written.
393 * Negative values indicate an error.
394 */
395 int mi_lttng_domain(struct mi_writer *writer,
396 struct lttng_domain *domain, int is_open);
397
398 /*
399 * Machine interface: open a channels element.
400 *
401 * writer An instance of a machine interface writer.
402 *
403 * Returns zero if the element's value could be written.
404 * Negative values indicate an error.
405 */
406 int mi_lttng_channels_open(struct mi_writer *writer);
407
408 /*
409 * Machine interface of struct channel.
410 *
411 * writer An instance of a machine interface writer.
412 * channel An instance of a channel.
413 *
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.
418 * ex: channel event.
419 *
420 * Returns zero if the element's value could be written.
421 * Negative values indicate an error.
422 */
423 int mi_lttng_channel(struct mi_writer *writer,
424 struct lttng_channel *channel, int is_open);
425
426 /*
427 * Machine interface of struct channel_attr.
428 *
429 * writer An instance of a machine interface writer.
430 * attr An instance of a channel_attr struct.
431 *
432 * Returns zero if the element's value could be written.
433 * Negative values indicate an error.
434 */
435 int mi_lttng_channel_attr(struct mi_writer *writer,
436 struct lttng_channel_attr *attr);
437
438 /*
439 * Machine interface for event common attributes.
440 *
441 * writer An instance of a mi writer.
442 * event single trace event.
443 *
444 * The common attribute are:
445 * - mi event element
446 * - event name
447 * - event type
448 * - enabled tag
449 * - event filter
450 *
451 * Returns zero if the element's value could be written.
452 * Negative values indicate an error.
453 */
454 int mi_lttng_event_common_attributes(struct mi_writer *writer,
455 struct lttng_event *event);
456
457 /*
458 * Machine interface for kernel tracepoint event with a loglevel.
459 *
460 * writer An instance of a mi writer.
461 * event single trace event.
462 * domain Event's domain
463 *
464 * Returns zero if the element's value could be written.
465 * Negative values indicate an error.
466 */
467 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
468 struct lttng_event *event, enum lttng_domain_type domain);
469
470 /*
471 * Machine interface for kernel tracepoint event with no loglevel.
472 *
473 * writer An instance of a mi writer.
474 * event single trace event.
475 *
476 * Returns zero if the element's value could be written.
477 * Negative values indicate an error.
478 */
479 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
480 struct lttng_event *event);
481
482 /*
483 * Machine interface for kernel function and probe event.
484 *
485 * writer An instance of a mi writer.
486 * event single trace event.
487 *
488 * Returns zero if the element's value could be written.
489 * Negative values indicate an error.
490 */
491 int mi_lttng_event_function_probe(struct mi_writer *writer,
492 struct lttng_event *event);
493
494 /*
495 * Machine interface for kernel function entry event.
496 *
497 * writer An instance of a mi writer.
498 * event single trace event.
499 *
500 * Returns zero if the element's value could be written.
501 * Negative values indicate an error.
502 */
503 int mi_lttng_event_function_entry(struct mi_writer *writer,
504 struct lttng_event *event);
505
506 /*
507 * Machine interface: open an events element.
508 *
509 * writer An instance of a machine interface writer.
510 *
511 * Returns zero if the element's value could be written.
512 * Negative values indicate an error.
513 */
514 int mi_lttng_events_open(struct mi_writer *writer);
515
516 /*
517 * Machine interface for printing an event.
518 * The trace event type currently supported are:
519 * TRACEPOINT,
520 * PROBE,
521 * FUNCTION,
522 * FUNCTION_ENTRY,
523 * SYSCALL
524 *
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
532 *
533 * Returns zero if the element's value could be written.
534 * Negative values indicate an error.
535 */
536 int mi_lttng_event(struct mi_writer *writer, struct lttng_event *event,
537 int is_open, enum lttng_domain_type domain);
538
539 /*
540 * Machine interface for struct lttng_event_field.
541 *
542 * writer An instance of a mi writer.
543 * field An event_field instance.
544 *
545 * Returns zero if the element's value could be written.
546 * Negative values indicate an error.
547 */
548 int mi_lttng_event_field(struct mi_writer *writer,
549 struct lttng_event_field *field);
550
551 /*
552 * Machine interface: open a event_fields element.
553 *
554 * writer An instance of a machine interface writer.
555 *
556 * Returns zero if the element have be written.
557 * Negative values indicate an error.
558 */
559 int mi_lttng_event_fields_open(struct mi_writer *writer);
560
561 /*
562 * Machine interface: open a trackers element.
563 *
564 * writer An instance of a machine interface writer.
565 *
566 * Returns zero if the element's value could be written.
567 * Negative values indicate an error.
568 */
569 int mi_lttng_trackers_open(struct mi_writer *writer);
570
571 /*
572 * Machine interface: open a pid_tracker element.
573 *
574 * writer An instance of a machine interface writer.
575 *
576 * Returns zero if the element's value could be written.
577 * Negative values indicate an error.
578 *
579 * Note: A targets element is also opened for each tracker definition
580 */
581 int mi_lttng_pid_tracker_open(struct mi_writer *writer);
582
583 /*
584 * Machine interface: open a PIDs element.
585 *
586 * writer An instance of a machine interface writer.
587 *
588 * Returns zero if the element's value could be written.
589 * Negative values indicate an error.
590 */
591 int mi_lttng_pids_open(struct mi_writer *writer);
592
593 /*
594 * Machine interface: open a processes element.
595 *
596 * writer An instance of a machine interface writer.
597 *
598 * Returns zero if the element's value could be written.
599 * Negative values indicate an error.
600 */
601 int mi_lttng_processes_open(struct mi_writer *writer);
602
603 /*
604 * Machine interface of a Process.
605 *
606 * writer An instance of a machine interface writer.
607 * pid A PID.
608 *
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
613 * ex: channel event.
614 *
615 * Returns zero if the element's value could be written.
616 * Negative values indicate an error.
617 */
618 int mi_lttng_process(struct mi_writer *writer, pid_t pid , const char *name,
619 int is_open);
620 /*
621 * Machine interface: open a targets element.
622 *
623 * writer An instance of a machine interface writer.
624 *
625 * Returns zero if the element's value could be written.
626 * Negative values indicate an error.
627 */
628 int mi_lttng_targets_open(struct mi_writer *writer);
629
630 /*
631 * Machine interface for track/untrack a pid_target
632 *
633 * writer An instance of a machine interface writer.
634 *
635 * Returns zero if the element's value could be written.
636 * Negative values indicate an error.
637 */
638 int mi_lttng_pid_target(struct mi_writer *writer, pid_t pid, int is_open);
639
640 /*
641 * Machine interface for struct lttng_calibrate.
642 *
643 * writer An instance of a machine interface writer.
644 *
645 * calibrate A lttng_calibrate instance.
646 *
647 * Returns zero if the element's value could be written.
648 * Negative values indicate an error.
649 */
650 int mi_lttng_calibrate(struct mi_writer *writer,
651 struct lttng_calibrate *calibrate);
652
653 /*
654 * Machine interface of a context.
655 *
656 * writer An instance of a machine interface writer
657 *
658 * context An instance of a lttng_event_context
659 *
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.
665 */
666 int mi_lttng_context(struct mi_writer *writer,
667 struct lttng_event_context *context, int is_open);
668
669 /*
670 * Machine interface of a perf_counter_context.
671 *
672 * writer An instance of a machine interface writer
673 *
674 * contest An instance of a lttng_event_perf_counter_ctx
675 *
676 * Returns zero if the element's value could be written.
677 * Negative values indicate an error.
678 */
679 int mi_lttng_perf_counter_context(struct mi_writer *writer,
680 struct lttng_event_perf_counter_ctx *perf_context);
681
682 /*
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
686 * of snapshots.
687 *
688 * writer An instance of a machine interface writer.
689 *
690 * session_name: Snapshot output for session "session_name".
691 *
692 * Note: The client has to close the session and the snapshots elements after
693 * having listed every lttng_snapshot_output.
694 *
695 * Returns zero if the element's value could be written.
696 * Negative values indicate an error.
697 */
698 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
699 const char *session_name);
700
701 /*
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.
709 *
710 * writer An instance of a machine interface writer.
711 *
712 * output: A list of snapshot_output.
713 *
714 * Returns zero if the element's value could be written.
715 * Negative values indicate an error.
716 */
717 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
718 struct lttng_snapshot_output *output);
719
720 /*
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
725 * was attached.
726 *
727 * Otherwise, it do the same process with the name of the snapshot, if the
728 * snapshot output id is undefined.
729 *
730 * writer An instance of a machine interface writer.
731 *
732 * id: ID of the snapshot output.
733 *
734 * name: Name of the snapshot.
735 *
736 * current_session_name: Session to which the snapshot belongs.
737 *
738 * Returns zero if the element's value could be written.
739 * Negative values indicate an error.
740 */
741 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
742 const char *name, const char *current_session_name);
743
744 /*
745 * Machine interface of the output of the command snapshot add output
746 * when adding a snapshot from a user URL.
747 *
748 * If the snapshot was successfully added, the machine interface lists
749 * these information:
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.
754 *
755 * writer An instance of a machine interface writer.
756 *
757 * current_session_name: Session to which the snapshot belongs.
758 *
759 * n_ptr:
760 *
761 * output: iterator over a lttng_snapshot_output_list which contain
762 * the snapshot output informations.
763 *
764 * Returns zero if the element's value could be written.
765 * Negative values indicate an error.
766 */
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);
770
771 /*
772 * Machine interface of the output of the command snapshot
773 * record from a URL (if given).
774 *
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.
778 *
779 * Otherwise, the machine interface output the data and ctrl url received
780 * from the command-line.
781 *
782 * writer An instance of a machine interface writer.
783 *
784 * current_session_name: Snapshot record for session "current_session_name".
785 *
786 * ctrl_url, data_url: Destination of the output receive from the command-line.
787 *
788 * Returns zero if the element's value could be written.
789 * Negative values indicate an error.
790 */
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);
794
795 #endif /* _MI_LTTNG_H */
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