1 #ifndef BABELTRACE_CTF_IR_STREAM_CLASS_H
2 #define BABELTRACE_CTF_IR_STREAM_CLASS_H
5 * BabelTrace - CTF IR: Stream Class
7 * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
9 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 * The Common Trace Format (CTF) Specification is available at
30 * http://www.efficios.com/ctf
34 #include <babeltrace/ctf-ir/visitor.h>
41 @defgroup ctfirstreamclass CTF IR stream class
43 @brief CTF IR stream class.
46 #include <babeltrace/ctf-ir/stream-class.h>
50 See \ref ctfwriterstreamclass which documents additional CTF IR stream
51 class functions exclusive to the CTF writer mode.
53 A CTF IR <strong><em>stream class</em></strong> is a template that you
54 can use to create concrete \link ctfirstream CTF IR streams\endlink.
56 A stream class has the following properties, both of which \em must
57 be unique amongst all the stream classes contained in the same
58 \link ctfirtraceclass CTF IR trace class\endlink:
63 In the Babeltrace CTF IR system, a \link ctfirtraceclass trace class\endlink
64 contains zero or more stream classes,
65 and a stream class contains zero or more
66 \link ctfireventclass event classes\endlink.
67 You can add an event class
68 to a stream class with bt_ctf_stream_class_add_event_class().
69 You can add a stream class to a trace class with
70 bt_ctf_trace_add_stream_class().
72 A stream class owns three \link ctfirfieldtypes field types\endlink:
74 - An optional <strong>stream packet context</strong> field type, which
75 represents the \c stream.packet.context CTF scope.
76 - An optional <strong>stream event header</strong> field type, which
77 represents the \c stream.event.header CTF scope.
78 - An optional <strong>stream event context</strong> field type, which
79 represents the \c stream.event.context CTF scope.
81 Those three field types \em must be structure field types as of
82 Babeltrace \btversion.
84 As per the CTF specification, the event header field type \em must
85 contain a field named \c id if the stream class contains more than one
88 As a reminder, here's the structure of a CTF packet:
92 Before you can create a stream from a stream class with
93 bt_ctf_stream_create(), you \em must add the prepared stream class to a
94 trace class by calling bt_ctf_trace_add_stream_class().
96 As with any Babeltrace object, CTF IR stream class objects have
97 <a href="https://en.wikipedia.org/wiki/Reference_counting">reference
98 counts</a>. See \ref refs to learn more about the reference counting
99 management of Babeltrace objects.
101 The following functions \em freeze their stream class parameter on
104 - bt_ctf_trace_add_stream_class()
105 - bt_ctf_event_create()
106 - bt_ctf_writer_create_stream()
107 (\link ctfwriter CTF writer\endlink mode only)
109 You cannot modify a frozen stream class: it is considered immutable,
112 - Adding an event class to it with
113 bt_ctf_stream_class_add_event_class().
114 - \link refs Reference counting\endlink.
119 @sa ctfwriterstreamclass
122 @brief CTF IR stream class type and functions.
125 @addtogroup ctfirstreamclass
130 @struct bt_ctf_stream_class
131 @brief A CTF IR stream class.
134 struct bt_ctf_stream_class
;
135 struct bt_ctf_event_class
;
139 @name Creation and parent access functions
144 @brief Creates a default CTF IR stream class named \p name, or a
145 default unnamed stream class if \p name is \c NULL.
147 On success, the packet context field type of the created stream class
148 has the following fields:
150 - <code>timestamp_begin</code>: a 64-bit unsigned integer field type.
151 - <code>timestamp_end</code>: a 64-bit unsigned integer field type.
152 - <code>content_size</code>: a 64-bit unsigned integer field type.
153 - <code>packet_size</code>: a 64-bit unsigned integer field type.
154 - <code>events_discarded</code>: a 64-bit unsigned integer field type.
156 On success, the event header field type of the created stream class
157 has the following fields:
159 - <code>code</code>: a 32-bit unsigned integer field type.
160 - <code>timestamp</code>: a 64-bit unsigned integer field type.
162 You can modify those default field types after the stream class is
163 created with bt_ctf_stream_class_set_packet_context_type() and
164 bt_ctf_stream_class_set_event_header_type().
166 @param[in] name Name of the stream class to create (can be \c NULL to
167 create an unnamed stream class).
168 @returns Created stream class, or \c NULL on error.
170 @postsuccessrefcountret1
172 extern struct bt_ctf_stream_class
*bt_ctf_stream_class_create(const char *name
);
175 @brief Returns the parent CTF IR trace class of the CTF IR stream
176 class \p stream_class.
178 It is possible that the stream class was not added to a trace class
179 yet, in which case this function returns \c NULL. You can add a
180 stream class to a trace class with
181 bt_ctf_trace_add_stream_class().
183 @param[in] stream_class Stream class of which to get the parent
185 @returns Parent trace class of \p stream_class,
186 or \c NULL if \p stream_class was not
187 added to a trace class yet or on error.
189 @prenotnull{stream_class}
190 @postrefcountsame{stream_class}
191 @postsuccessrefcountretinc
193 @sa bt_ctf_trace_add_stream_class(): Add a stream class to
196 extern struct bt_ctf_trace
*bt_ctf_stream_class_get_trace(
197 struct bt_ctf_stream_class
*stream_class
);
202 @name Properties functions
207 @brief Returns the name of the CTF IR stream class \p stream_class.
209 On success, \p stream_class remains the sole owner of the returned
212 @param[in] stream_class Stream class of which to get the name.
213 @returns Name of stream class \p stream_class, or
214 \c NULL if \p stream_class is unnamed or
217 @prenotnull{stream_class}
218 @postrefcountsame{stream_class}
220 @sa bt_ctf_stream_class_set_name(): Sets the name of a given
223 extern const char *bt_ctf_stream_class_get_name(
224 struct bt_ctf_stream_class
*stream_class
);
227 @brief Sets the name of the CTF IR stream class
228 \p stream_class to \p name.
230 \p name must be unique amongst the names of all the stream classes
231 of the trace class to which you eventually add \p stream_class.
233 @param[in] stream_class Stream class of which to set the name.
234 @param[in] name Name of the stream class (copied on success).
235 @returns 0 on success, or a negative value on error.
237 @prenotnull{stream_class}
239 @prehot{stream_class}
240 @postrefcountsame{stream_class}
242 @sa bt_ctf_stream_class_get_name(): Returns the name of a given
245 extern int bt_ctf_stream_class_set_name(
246 struct bt_ctf_stream_class
*stream_class
, const char *name
);
249 @brief Returns the numeric ID of the CTF IR stream class \p stream_class.
251 @param[in] stream_class Stream class of which to get the numeric ID.
252 @returns ID of stream class \p stream_class, or a
253 negative value on error.
255 @prenotnull{stream_class}
256 @postrefcountsame{stream_class}
258 @sa bt_ctf_stream_class_set_id(): Sets the numeric ID of a given
261 extern int64_t bt_ctf_stream_class_get_id(
262 struct bt_ctf_stream_class
*stream_class
);
265 @brief Sets the numeric ID of the CTF IR stream class
266 \p stream_class to \p id.
268 \p id must be unique amongst the IDs of all the stream classes
269 of the trace class to which you eventually add \p stream_class.
271 @param[in] stream_class Stream class of which to set the numeric ID.
272 @param[in] id ID of the stream class.
273 @returns 0 on success, or a negative value on error.
275 @prenotnull{stream_class}
276 @prehot{stream_class}
277 @pre \p id is lesser than or equal to 9223372036854775807 (\c INT64_MAX).
278 @postrefcountsame{stream_class}
280 @sa bt_ctf_stream_class_get_id(): Returns the numeric ID of a given
283 extern int bt_ctf_stream_class_set_id(
284 struct bt_ctf_stream_class
*stream_class
, uint64_t id
);
289 @name Contained field types functions
294 @brief Returns the packet context field type of the CTF IR stream class
297 @param[in] stream_class Stream class of which to get the packet
299 @returns Packet context field type of \p stream_class,
300 or \c NULL if \p stream_class has no packet context
301 field type or on error.
303 @prenotnull{stream_class}
304 @postrefcountsame{stream_class}
305 @post <strong>On success, if the return value is a field type</strong>, its
306 reference count is incremented.
308 @sa bt_ctf_stream_class_set_packet_context_type(): Sets the packet
309 context field type of a given stream class.
311 extern struct bt_ctf_field_type
*bt_ctf_stream_class_get_packet_context_type(
312 struct bt_ctf_stream_class
*stream_class
);
315 @brief Sets the packet context field type of the CTF IR stream class
316 \p stream_class to \p packet_context_type, or unsets the current packet
317 context field type from \p stream_class.
319 If \p packet_context_type is \c NULL, then this function unsets the current
320 packet context field type from \p stream_class, effectively making
321 \p stream_class a stream class without a packet context field type.
323 As of Babeltrace \btversion, if \p packet_context_type is not \c NULL,
324 \p packet_context_type \em must be a CTF IR structure field type object.
326 @param[in] stream_class Stream class of which to set the packet
328 @param[in] packet_context_type Packet context field type, or \c NULL to unset
329 the current packet context field type.
330 @returns 0 on success, or a negative value on error.
332 @prenotnull{stream_class}
333 @prehot{stream_class}
334 @pre <strong>\p packet_context_type, if not \c NULL</strong>, is a CTF IR
335 structure field type.
336 @postrefcountsame{stream_class}
337 @post <strong>On success, if \p packet_context_type is not \c NULL</strong>,
338 the reference count of \p packet_context_type is incremented.
340 @sa bt_ctf_stream_class_get_packet_context_type(): Returns the packet
341 context field type of a given stream class.
343 extern int bt_ctf_stream_class_set_packet_context_type(
344 struct bt_ctf_stream_class
*stream_class
,
345 struct bt_ctf_field_type
*packet_context_type
);
348 @brief Returns the event header field type of the CTF IR stream class
351 @param[in] stream_class Stream class of which to get the event header
353 @returns Event header field type of \p stream_class,
354 or \c NULL if \p stream_class has no event header field
357 @prenotnull{stream_class}
358 @postrefcountsame{stream_class}
359 @post <strong>On success, if the return value is a field type</strong>, its
360 reference count is incremented.
362 @sa bt_ctf_stream_class_set_event_header_type(): Sets the event
363 header field type of a given stream class.
365 extern struct bt_ctf_field_type
*
366 bt_ctf_stream_class_get_event_header_type(
367 struct bt_ctf_stream_class
*stream_class
);
370 @brief Sets the event header field type of the CTF IR stream class
371 \p stream_class to \p event_header_type, or unsets the current event
372 header field type from \p stream_class.
374 If \p event_header_type is \c NULL, then this function unsets the current
375 event header field type from \p stream_class, effectively making \p stream_class
376 a stream class without a event header field type.
378 As of Babeltrace \btversion, if \p event_header_type is not \c NULL,
379 \p event_header_type \em must be a CTF IR structure field type object.
381 @param[in] stream_class Stream class of which to set the event
383 @param[in] event_header_type Event header field type, or \c NULL to unset
384 the current event header field type.
385 @returns 0 on success, or a negative value on error.
387 @prenotnull{stream_class}
388 @prehot{stream_class}
389 @pre <strong>\p event_header_type, if not \c NULL</strong>, is a CTF IR
390 structure field type.
391 @postrefcountsame{stream_class}
392 @post <strong>On success, if \p event_header_type is not \c NULL</strong>,
393 the reference count of \p event_header_type is incremented.
395 @sa bt_ctf_stream_class_get_event_header_type(): Returns the event
396 header field type of a given stream class.
398 extern int bt_ctf_stream_class_set_event_header_type(
399 struct bt_ctf_stream_class
*stream_class
,
400 struct bt_ctf_field_type
*event_header_type
);
403 @brief Returns the event context field type of the CTF IR stream class
406 @param[in] stream_class Stream class of which to get the event context
408 @returns Event context field type of \p stream_class,
409 or \c NULL if \p stream_class has no event context field
412 @prenotnull{stream_class}
413 @postrefcountsame{stream_class}
414 @post <strong>On success, if the return value is a field type</strong>,
415 its reference count is incremented.
418 @sa bt_ctf_stream_class_set_event_context_type(): Sets the event
419 context field type of a given stream class.
421 extern struct bt_ctf_field_type
*
422 bt_ctf_stream_class_get_event_context_type(
423 struct bt_ctf_stream_class
*stream_class
);
426 @brief Sets the event context field type of the CTF IR stream class
427 \p stream_class to \p event_context_type, or unsets the current event
428 context field type from \p stream_class.
430 If \p event_context_type is \c NULL, then this function unsets the current
431 event context field type from \p stream_class, effectively making \p
432 stream_class a stream class without a event context field type.
434 As of Babeltrace \btversion, if \p event_context_type is not \c NULL,
435 \p event_context_type \em must be a CTF IR structure field type object.
437 @param[in] stream_class Stream class of which to set the packet
439 @param[in] event_context_type Event context field type, or \c NULL to unset
440 the current event context field type.
441 @returns 0 on success, or a negative value on error.
443 @prenotnull{stream_class}
444 @prehot{stream_class}
445 @pre <strong>\p event_context_type, if not \c NULL</strong>, is a CTF IR
446 structure field type.
447 @postrefcountsame{stream_class}
448 @post <strong>On success, if \p event_context_type is not \c NULL</strong>,
449 the reference count of \p event_context_type is incremented.
451 @sa bt_ctf_stream_class_get_event_context_type(): Returns the event context
452 field type of a given stream class.
454 extern int bt_ctf_stream_class_set_event_context_type(
455 struct bt_ctf_stream_class
*stream_class
,
456 struct bt_ctf_field_type
*event_context_type
);
461 @name Event class children functions
466 @brief Returns the number of event classes contained in the
467 CTF IR stream class \p stream_class.
469 @param[in] stream_class Stream class of which to get the number
470 of children event classes.
471 @returns Number of children event classes
472 contained in \p stream_class, or
473 a negative value on error.
475 @prenotnull{stream_class}
476 @postrefcountsame{stream_class}
478 extern int64_t bt_ctf_stream_class_get_event_class_count(
479 struct bt_ctf_stream_class
*stream_class
);
482 @brief Returns the event class at index \p index in the CTF IR stream
483 class \p stream_class.
485 @param[in] stream_class Stream class of which to get the event class.
486 @param[in] index Index of the event class to find.
487 @returns Event class at index \p index, or \c NULL
490 @prenotnull{stream_class}
491 @pre \p index is lesser than the number of event classes contained in the
492 stream class \p stream_class (see
493 bt_ctf_stream_class_get_event_class_count()).
494 @postrefcountsame{stream_class}
495 @postsuccessrefcountretinc
497 @sa bt_ctf_stream_class_get_event_class_by_id(): Finds an event class
499 @sa bt_ctf_stream_class_get_event_class_by_name(): Finds an event class
502 extern struct bt_ctf_event_class
*bt_ctf_stream_class_get_event_class_by_index(
503 struct bt_ctf_stream_class
*stream_class
, uint64_t index
);
506 @brief Returns the event class named \c name found in the CTF IR stream
507 class \p stream_class.
509 @param[in] stream_class Stream class of which to get the event class.
510 @param[in] name Name of the event class to find.
511 @returns Event class named \p name, or \c NULL
514 @prenotnull{stream_class}
516 @postrefcountsame{stream_class}
517 @postsuccessrefcountretinc
519 @sa bt_ctf_stream_class_get_event_class_by_id(): Finds an event class
522 extern struct bt_ctf_event_class
*bt_ctf_stream_class_get_event_class_by_name(
523 struct bt_ctf_stream_class
*stream_class
, const char *name
);
526 @brief Returns the event class with ID \c id found in the CTF IR stream
527 class \p stream_class.
529 @param[in] stream_class Stream class of which to get the event class.
530 @param[in] id ID of the event class to find.
531 @returns Event class with ID \p id, or \c NULL
534 @prenotnull{stream_class}
535 @postrefcountsame{stream_class}
536 @postsuccessrefcountretinc
538 @sa bt_ctf_stream_class_get_event_class_by_name(): Finds an event class
541 extern struct bt_ctf_event_class
*bt_ctf_stream_class_get_event_class_by_id(
542 struct bt_ctf_stream_class
*stream_class
, uint64_t id
);
545 @brief Adds the CTF IR event class \p event_class to the
546 CTF IR stream class \p stream_class.
548 On success, \p event_class becomes the child of \p stream_class.
550 You can only add a given event class to one stream class.
552 You can call this function even if \p stream_class is frozen. Adding
553 event classes is the only operation that is permitted
554 on a frozen stream class.
556 This function tries to resolve the needed
557 \link ctfirfieldtypes CTF IR field type\endlink of the dynamic field
558 types that are found anywhere in the context or payload field
559 types of \p event_class. If any automatic resolving fails:
561 - If the needed field type should be found in one of the root field
562 types of \p event_class or \p stream_class, this function fails.
563 - If \p stream_class is the child of a
564 \link ctfirtraceclass CTF IR trace class\endlink (it was added
565 with bt_ctf_trace_add_stream_class()), this function fails.
566 - If \p stream_class is not the child of a trace class yet, the
567 automatic resolving is reported to the next call to
568 bt_ctf_trace_add_stream_class() with \p stream_class.
570 @param[in] stream_class Stream class to which to add \p event_class.
571 @param[in] event_class Event class to add to \p stream_class.
572 @returns 0 on success, or a negative value on error.
574 @prenotnull{stream_class}
575 @prenotnull{event_class}
577 @postrefcountsame{stream_class}
578 @postsuccessrefcountinc{event_class}
579 @postsuccessfrozen{event_class}
581 extern int bt_ctf_stream_class_add_event_class(
582 struct bt_ctf_stream_class
*stream_class
,
583 struct bt_ctf_event_class
*event_class
);
593 @brief Accepts the visitor \p visitor to visit the hierarchy of the
594 CTF IR stream class \p stream_class.
596 This function traverses the hierarchy of \p stream_class in pre-order
597 and calls \p visitor on each element.
599 The stream class itself is visited first, and then all its children
602 @param[in] stream_class Stream class to visit.
603 @param[in] visitor Visiting function.
604 @param[in] data User data.
605 @returns 0 on success, or a negative value on error.
607 @prenotnull{stream_class}
610 extern int bt_ctf_stream_class_visit(struct bt_ctf_stream_class
*stream_class
,
611 bt_ctf_visitor visitor
, void *data
);
621 #endif /* BABELTRACE_CTF_IR_STREAM_CLASS_H */
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