| 1 | #ifndef BABELTRACE_CTF_IR_STREAM_CLASS_H |
| 2 | #define BABELTRACE_CTF_IR_STREAM_CLASS_H |
| 3 | |
| 4 | /* |
| 5 | * BabelTrace - CTF IR: Stream Class |
| 6 | * |
| 7 | * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 8 | * |
| 9 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 10 | * |
| 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: |
| 17 | * |
| 18 | * The above copyright notice and this permission notice shall be included in |
| 19 | * all copies or substantial portions of the Software. |
| 20 | * |
| 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 |
| 27 | * SOFTWARE. |
| 28 | * |
| 29 | * The Common Trace Format (CTF) Specification is available at |
| 30 | * http://www.efficios.com/ctf |
| 31 | */ |
| 32 | |
| 33 | #include <stdint.h> |
| 34 | #include <babeltrace/ctf-ir/visitor.h> |
| 35 | |
| 36 | #ifdef __cplusplus |
| 37 | extern "C" { |
| 38 | #endif |
| 39 | |
| 40 | /** |
| 41 | @defgroup ctfirstreamclass CTF IR stream class |
| 42 | @ingroup ctfir |
| 43 | @brief CTF IR stream class. |
| 44 | |
| 45 | @note |
| 46 | See \ref ctfirwriterstreamclass which documents additional CTF IR stream |
| 47 | class functions exclusive to the CTF IR writer mode. |
| 48 | |
| 49 | A CTF IR <strong><em>stream class</em></strong> is a template that you |
| 50 | can use to create concrete \link ctfirstream CTF IR streams\endlink. |
| 51 | |
| 52 | A stream class has the following properties, both of which \em must |
| 53 | be unique amongst all the stream classes contained in the same |
| 54 | \link ctfirtraceclass CTF IR trace class\endlink: |
| 55 | |
| 56 | - A \b name. |
| 57 | - A numeric \b ID. |
| 58 | |
| 59 | In the Babeltrace CTF IR system, a \link ctfirtraceclass trace class\endlink |
| 60 | contains zero or more stream classes, |
| 61 | and a stream class contains zero or more |
| 62 | \link ctfireventclass event classes\endlink. |
| 63 | You can add an event class |
| 64 | to a stream class with bt_ctf_stream_class_add_event_class(). |
| 65 | You can add a stream class to a trace class with |
| 66 | bt_ctf_trace_add_stream_class(). |
| 67 | |
| 68 | A stream class owns three \link ctfirfieldtypes field types\endlink: |
| 69 | |
| 70 | - An optional <strong>stream packet context</strong> field type, which |
| 71 | represents the \c stream.packet.context CTF scope. |
| 72 | - An optional <strong>stream event header</strong> field type, which |
| 73 | represents the \c stream.event.header CTF scope. |
| 74 | - An optional <strong>stream event context</strong> field type, which |
| 75 | represents the \c stream.event.context CTF scope. |
| 76 | |
| 77 | Those three field types \em must be structure field types as of |
| 78 | Babeltrace \btversion. |
| 79 | |
| 80 | As per the CTF specification, the event header field type \em must |
| 81 | contain a field named \c id if the stream class contains more than one |
| 82 | event class. |
| 83 | |
| 84 | As a reminder, here's the structure of a CTF packet: |
| 85 | |
| 86 | @imgpacketstructure |
| 87 | |
| 88 | Before you can create a stream from a stream class with |
| 89 | bt_ctf_stream_create(), you \em must add the prepared stream class to a |
| 90 | trace class by calling bt_ctf_trace_add_stream_class(). |
| 91 | |
| 92 | As with any Babeltrace object, CTF IR stream class objects have |
| 93 | <a href="https://en.wikipedia.org/wiki/Reference_counting">reference |
| 94 | counts</a>. See \ref refs to learn more about the reference counting |
| 95 | management of Babeltrace objects. |
| 96 | |
| 97 | The following functions \em freeze their stream class parameter on |
| 98 | success: |
| 99 | |
| 100 | - bt_ctf_trace_add_stream_class() |
| 101 | - bt_ctf_event_create() |
| 102 | - bt_ctf_writer_create_stream() |
| 103 | (\link ctfirwriter CTF IR writer\endlink mode only) |
| 104 | |
| 105 | You cannot modify a frozen stream class: it is considered immutable, |
| 106 | except for: |
| 107 | |
| 108 | - Adding an event class to it with |
| 109 | bt_ctf_stream_class_add_event_class(). |
| 110 | - \link refs Reference counting\endlink. |
| 111 | |
| 112 | @sa ctfirstream |
| 113 | @sa ctfireventclass |
| 114 | @sa ctfirtraceclass |
| 115 | @sa ctfirwriterstreamclass |
| 116 | |
| 117 | @file |
| 118 | @brief CTF IR stream class type and functions. |
| 119 | @sa ctfirstreamclass |
| 120 | |
| 121 | @addtogroup ctfirstreamclass |
| 122 | @{ |
| 123 | */ |
| 124 | |
| 125 | /** |
| 126 | @struct bt_ctf_stream_class |
| 127 | @brief A CTF IR stream class. |
| 128 | @sa ctfirstreamclass |
| 129 | */ |
| 130 | struct bt_ctf_stream_class; |
| 131 | struct bt_ctf_event_class; |
| 132 | struct bt_ctf_clock; |
| 133 | |
| 134 | /** |
| 135 | @name Creation and parent access functions |
| 136 | @{ |
| 137 | */ |
| 138 | |
| 139 | /** |
| 140 | @brief Creates a default CTF IR stream class named \p name, or a |
| 141 | default unnamed stream class if \p name is \c NULL. |
| 142 | |
| 143 | On success, the packet context field type of the created stream class |
| 144 | has the following fields: |
| 145 | |
| 146 | - <code>timestamp_begin</code>: a 64-bit unsigned integer field type. |
| 147 | - <code>timestamp_end</code>: a 64-bit unsigned integer field type. |
| 148 | - <code>content_size</code>: a 64-bit unsigned integer field type. |
| 149 | - <code>packet_size</code>: a 64-bit unsigned integer field type. |
| 150 | - <code>events_discarded</code>: a 64-bit unsigned integer field type. |
| 151 | |
| 152 | On success, the event header field type of the created stream class |
| 153 | has the following fields: |
| 154 | |
| 155 | - <code>code</code>: a 32-bit unsigned integer field type. |
| 156 | - <code>timestamp</code>: a 64-bit unsigned integer field type. |
| 157 | |
| 158 | You can modify those default field types after the stream class is |
| 159 | created with bt_ctf_stream_class_set_packet_context_type() and |
| 160 | bt_ctf_stream_class_set_event_header_type(). |
| 161 | |
| 162 | @param[in] name Name of the stream class to create (can be \c NULL to |
| 163 | create an unnamed stream class). |
| 164 | @returns Created stream class, or \c NULL on error. |
| 165 | |
| 166 | @postsuccessrefcountret1 |
| 167 | */ |
| 168 | extern struct bt_ctf_stream_class *bt_ctf_stream_class_create(const char *name); |
| 169 | |
| 170 | /** |
| 171 | @brief Returns the parent CTF IR trace class of the CTF IR stream |
| 172 | class \p stream_class. |
| 173 | |
| 174 | It is possible that the stream class was not added to a trace class |
| 175 | yet, in which case this function returns \c NULL. You can add a |
| 176 | stream class to a trace class with |
| 177 | bt_ctf_trace_add_stream_class(). |
| 178 | |
| 179 | @param[in] stream_class Stream class of which to get the parent |
| 180 | trace class. |
| 181 | @returns Parent trace class of \p stream_class, |
| 182 | or \c NULL if \p stream_class was not |
| 183 | added to a trace class yet or on error. |
| 184 | |
| 185 | @prenotnull{stream_class} |
| 186 | @postsuccessrefcountretinc |
| 187 | |
| 188 | @sa bt_ctf_trace_add_stream_class(): Add a stream class to |
| 189 | a trace class. |
| 190 | */ |
| 191 | extern struct bt_ctf_trace *bt_ctf_stream_class_get_trace( |
| 192 | struct bt_ctf_stream_class *stream_class); |
| 193 | |
| 194 | /** @} */ |
| 195 | |
| 196 | /** |
| 197 | @name Properties functions |
| 198 | @{ |
| 199 | */ |
| 200 | |
| 201 | /** |
| 202 | @brief Returns the name of the CTF IR stream class \p stream_class. |
| 203 | |
| 204 | On success, \p stream_class remains the sole owner of the returned |
| 205 | string. |
| 206 | |
| 207 | @param[in] stream_class Stream class of which to get the name. |
| 208 | @returns Name of stream class \p stream_class, or |
| 209 | \c NULL if \p stream_class is unnamed or |
| 210 | on error. |
| 211 | |
| 212 | @prenotnull{stream_class} |
| 213 | @postrefcountsame{stream_class} |
| 214 | |
| 215 | @sa bt_ctf_stream_class_set_name(): Sets the name of a given |
| 216 | stream class. |
| 217 | */ |
| 218 | extern const char *bt_ctf_stream_class_get_name( |
| 219 | struct bt_ctf_stream_class *stream_class); |
| 220 | |
| 221 | /** |
| 222 | @brief Sets the name of the CTF IR stream class |
| 223 | \p stream_class to \p name. |
| 224 | |
| 225 | \p name must be unique amongst the names of all the stream classes |
| 226 | of the trace class to which you eventually add \p stream_class. |
| 227 | |
| 228 | @param[in] stream_class Stream class of which to set the name. |
| 229 | @param[in] name Name of the stream class (copied on success). |
| 230 | @returns 0 on success, or a negative value on error. |
| 231 | |
| 232 | @prenotnull{stream_class} |
| 233 | @prenotnull{name} |
| 234 | @prehot{stream_class} |
| 235 | @postrefcountsame{stream_class} |
| 236 | |
| 237 | @sa bt_ctf_stream_class_get_name(): Returns the name of a given |
| 238 | stream class. |
| 239 | */ |
| 240 | extern int bt_ctf_stream_class_set_name( |
| 241 | struct bt_ctf_stream_class *stream_class, const char *name); |
| 242 | |
| 243 | /** |
| 244 | @brief Returns the numeric ID of the CTF IR stream class \p stream_class. |
| 245 | |
| 246 | @param[in] stream_class Stream class of which to get the numeric ID. |
| 247 | @returns ID of stream class \p stream_class, or a |
| 248 | negative value on error. |
| 249 | |
| 250 | @prenotnull{stream_class} |
| 251 | @postrefcountsame{stream_class} |
| 252 | |
| 253 | @sa bt_ctf_stream_class_set_id(): Sets the numeric ID of a given |
| 254 | stream class. |
| 255 | */ |
| 256 | extern int64_t bt_ctf_stream_class_get_id( |
| 257 | struct bt_ctf_stream_class *stream_class); |
| 258 | |
| 259 | /** |
| 260 | @brief Sets the numeric ID of the CTF IR stream class |
| 261 | \p stream_class to \p id. |
| 262 | |
| 263 | \p id must be unique amongst the IDs of all the stream classes |
| 264 | of the trace class to which you eventually add \p stream_class. |
| 265 | |
| 266 | @param[in] stream_class Stream class of which to set the numeric ID. |
| 267 | @param[in] id ID of the stream class. |
| 268 | @returns 0 on success, or a negative value on error. |
| 269 | |
| 270 | @prenotnull{stream_class} |
| 271 | @prehot{stream_class} |
| 272 | @postrefcountsame{stream_class} |
| 273 | |
| 274 | @sa bt_ctf_stream_class_get_id(): Returns the numeric ID of a given |
| 275 | stream class. |
| 276 | */ |
| 277 | extern int bt_ctf_stream_class_set_id( |
| 278 | struct bt_ctf_stream_class *stream_class, uint32_t id); |
| 279 | |
| 280 | /** @} */ |
| 281 | |
| 282 | /** |
| 283 | @name Contained field types functions |
| 284 | @{ |
| 285 | */ |
| 286 | |
| 287 | /** |
| 288 | @brief Returns the packet context field type of the CTF IR stream class |
| 289 | \p stream_class. |
| 290 | |
| 291 | @param[in] stream_class Stream class of which to get the packet |
| 292 | context field type. |
| 293 | @returns Packet context field type of \p stream_class, |
| 294 | or \c NULL on error. |
| 295 | |
| 296 | @prenotnull{stream_class} |
| 297 | @postsuccessrefcountretinc |
| 298 | |
| 299 | @sa bt_ctf_stream_class_set_packet_context_type(): Sets the packet |
| 300 | context field type of a given stream class. |
| 301 | */ |
| 302 | extern struct bt_ctf_field_type *bt_ctf_stream_class_get_packet_context_type( |
| 303 | struct bt_ctf_stream_class *stream_class); |
| 304 | |
| 305 | /** |
| 306 | @brief Sets the packet context field type of the CTF IR stream class |
| 307 | \p stream_class to \p packet_context_type. |
| 308 | |
| 309 | As of Babeltrace \btversion, \p packet_context_type \em must be a |
| 310 | CTF IR structure field type object. |
| 311 | |
| 312 | @param[in] stream_class Stream class of which to set the packet |
| 313 | context field type. |
| 314 | @param[in] packet_context_type Packet context field type. |
| 315 | @returns 0 on success, or a negative value on error. |
| 316 | |
| 317 | @prenotnull{stream_class} |
| 318 | @prenotnull{packet_context_type} |
| 319 | @prehot{stream_class} |
| 320 | @preisstructft{packet_context_type} |
| 321 | @postrefcountsame{stream_class} |
| 322 | @postsuccessrefcountinc{packet_context_type} |
| 323 | |
| 324 | @sa bt_ctf_stream_class_get_packet_context_type(): Returns the packet |
| 325 | context field type of a given stream class. |
| 326 | */ |
| 327 | extern int bt_ctf_stream_class_set_packet_context_type( |
| 328 | struct bt_ctf_stream_class *stream_class, |
| 329 | struct bt_ctf_field_type *packet_context_type); |
| 330 | |
| 331 | /** |
| 332 | @brief Returns the event header field type of the CTF IR stream class |
| 333 | \p stream_class. |
| 334 | |
| 335 | @param[in] stream_class Stream class of which to get the event header |
| 336 | field type. |
| 337 | @returns Event header field type of \p stream_class, |
| 338 | or \c NULL on error. |
| 339 | |
| 340 | @prenotnull{stream_class} |
| 341 | @postsuccessrefcountretinc |
| 342 | |
| 343 | @sa bt_ctf_stream_class_set_event_header_type(): Sets the event |
| 344 | header field type of a given stream class. |
| 345 | */ |
| 346 | extern struct bt_ctf_field_type * |
| 347 | bt_ctf_stream_class_get_event_header_type( |
| 348 | struct bt_ctf_stream_class *stream_class); |
| 349 | |
| 350 | /** |
| 351 | @brief Sets the event header field type of the CTF IR stream class |
| 352 | \p stream_class to \p event_header_type. |
| 353 | |
| 354 | As of Babeltrace \btversion, \p event_header_type \em must be a |
| 355 | CTF IR structure field type object. |
| 356 | |
| 357 | @param[in] stream_class Stream class of which to set the event |
| 358 | header field type. |
| 359 | @param[in] event_header_type Event header field type. |
| 360 | @returns 0 on success, or a negative value on error. |
| 361 | |
| 362 | @prenotnull{stream_class} |
| 363 | @prenotnull{event_header_type} |
| 364 | @prehot{stream_class} |
| 365 | @preisstructft{event_header_type} |
| 366 | @postrefcountsame{stream_class} |
| 367 | @postsuccessrefcountinc{event_header_type} |
| 368 | |
| 369 | @sa bt_ctf_stream_class_get_event_header_type(): Returns the event |
| 370 | header field type of a given stream class. |
| 371 | */ |
| 372 | extern int bt_ctf_stream_class_set_event_header_type( |
| 373 | struct bt_ctf_stream_class *stream_class, |
| 374 | struct bt_ctf_field_type *event_header_type); |
| 375 | |
| 376 | /** |
| 377 | @brief Returns the per-stream class event context field type of the |
| 378 | CTF IR stream class \p stream_class. |
| 379 | |
| 380 | @param[in] stream_class Stream class of which to get the per-stream |
| 381 | class event context field type. |
| 382 | @returns Per-stream class event context field type of |
| 383 | \p stream_class, or \c NULL on error. |
| 384 | |
| 385 | @prenotnull{stream_class} |
| 386 | @postsuccessrefcountretinc |
| 387 | |
| 388 | @sa bt_ctf_stream_class_set_event_context_type(): Sets the per-stream |
| 389 | class event context field type of a given stream class. |
| 390 | */ |
| 391 | extern struct bt_ctf_field_type * |
| 392 | bt_ctf_stream_class_get_event_context_type( |
| 393 | struct bt_ctf_stream_class *stream_class); |
| 394 | |
| 395 | /** |
| 396 | @brief Sets the per-stream class event context field type of the CTF |
| 397 | IR stream class \p stream_class to \p event_context_type. |
| 398 | |
| 399 | As of Babeltrace \btversion, \p event_context_type \em must be a |
| 400 | CTF IR structure field type object. |
| 401 | |
| 402 | @param[in] stream_class Stream class of which to set the |
| 403 | per-stream class event context |
| 404 | field type. |
| 405 | @param[in] event_context_type Per-stream class event context context |
| 406 | field type. |
| 407 | @returns 0 on success, or a negative value on error. |
| 408 | |
| 409 | @prenotnull{stream_class} |
| 410 | @prenotnull{event_context_type} |
| 411 | @prehot{stream_class} |
| 412 | @preisstructft{event_context_type} |
| 413 | @postrefcountsame{stream_class} |
| 414 | @postsuccessrefcountinc{event_context_type} |
| 415 | |
| 416 | @sa bt_ctf_stream_class_get_event_context_type(): Returns the per-stream |
| 417 | class event context field type of a given stream class. |
| 418 | */ |
| 419 | extern int bt_ctf_stream_class_set_event_context_type( |
| 420 | struct bt_ctf_stream_class *stream_class, |
| 421 | struct bt_ctf_field_type *event_context_type); |
| 422 | |
| 423 | /** @} */ |
| 424 | |
| 425 | /** |
| 426 | @name Event class children functions |
| 427 | @{ |
| 428 | */ |
| 429 | |
| 430 | /** |
| 431 | @brief Returns the number of event classes contained in the |
| 432 | CTF IR stream class \p stream_class. |
| 433 | |
| 434 | @param[in] stream_class Stream class of which to get the number |
| 435 | of children event classes. |
| 436 | @returns Number of children event classes |
| 437 | contained in \p stream_class, or |
| 438 | a negative value on error. |
| 439 | |
| 440 | @prenotnull{stream_class} |
| 441 | @postrefcountsame{stream_class} |
| 442 | */ |
| 443 | extern int bt_ctf_stream_class_get_event_class_count( |
| 444 | struct bt_ctf_stream_class *stream_class); |
| 445 | |
| 446 | /** |
| 447 | @brief Returns the event class at index \p index in the CTF IR stream |
| 448 | class \p stream_class. |
| 449 | |
| 450 | @param[in] stream_class Stream class of which to get the event class. |
| 451 | @param[in] index Index of the event class to find. |
| 452 | @returns Event class at index \p index, or \c NULL |
| 453 | on error. |
| 454 | |
| 455 | @prenotnull{stream_class} |
| 456 | @pre \p index is lesser than the number of event classes contained in the |
| 457 | stream class \p stream_class (see |
| 458 | bt_ctf_stream_class_get_event_class_count()). |
| 459 | @postrefcountsame{stream_class} |
| 460 | @postsuccessrefcountretinc |
| 461 | |
| 462 | @sa bt_ctf_stream_class_get_event_class_by_id(): Finds an event class |
| 463 | by ID. |
| 464 | @sa bt_ctf_stream_class_get_event_class_by_name(): Finds an event class |
| 465 | by name. |
| 466 | */ |
| 467 | extern struct bt_ctf_event_class *bt_ctf_stream_class_get_event_class( |
| 468 | struct bt_ctf_stream_class *stream_class, int index); |
| 469 | |
| 470 | /** |
| 471 | @brief Returns the event class named \c name found in the CTF IR stream |
| 472 | class \p stream_class. |
| 473 | |
| 474 | @param[in] stream_class Stream class of which to get the event class. |
| 475 | @param[in] name Name of the event class to find. |
| 476 | @returns Event class named \p name, or \c NULL |
| 477 | on error. |
| 478 | |
| 479 | @prenotnull{stream_class} |
| 480 | @prenotnull{name} |
| 481 | @postrefcountsame{stream_class} |
| 482 | @postsuccessrefcountretinc |
| 483 | |
| 484 | @sa bt_ctf_stream_class_get_event_class_by_id(): Finds an event class |
| 485 | by ID. |
| 486 | */ |
| 487 | extern struct bt_ctf_event_class *bt_ctf_stream_class_get_event_class_by_name( |
| 488 | struct bt_ctf_stream_class *stream_class, const char *name); |
| 489 | |
| 490 | /** |
| 491 | @brief Returns the event class with ID \c id found in the CTF IR stream |
| 492 | class \p stream_class. |
| 493 | |
| 494 | @param[in] stream_class Stream class of which to get the event class. |
| 495 | @param[in] id ID of the event class to find. |
| 496 | @returns Event class with ID \p id, or \c NULL |
| 497 | on error. |
| 498 | |
| 499 | @prenotnull{stream_class} |
| 500 | @postrefcountsame{stream_class} |
| 501 | @postsuccessrefcountretinc |
| 502 | |
| 503 | @sa bt_ctf_stream_class_get_event_class_by_name(): Finds an event class |
| 504 | by name. |
| 505 | */ |
| 506 | extern struct bt_ctf_event_class *bt_ctf_stream_class_get_event_class_by_id( |
| 507 | struct bt_ctf_stream_class *stream_class, uint32_t id); |
| 508 | |
| 509 | /** |
| 510 | @brief Adds the CTF IR event class \p event_class to the |
| 511 | CTF IR stream class \p stream_class. |
| 512 | |
| 513 | On success, \p event_class becomes the child of \p stream_class. |
| 514 | |
| 515 | You can only add a given event class to one stream class. |
| 516 | |
| 517 | You can call this function even if \p stream_class is frozen. Adding |
| 518 | event classes is the only operation that is permitted |
| 519 | on a frozen stream class. |
| 520 | |
| 521 | @param[in] stream_class Stream class to which to add \p event_class. |
| 522 | @param[in] event_class Event class to add to \p stream_class. |
| 523 | @returns 0 on success, or a negative value on error. |
| 524 | |
| 525 | @prenotnull{stream_class} |
| 526 | @prenotnull{event_class} |
| 527 | @prehot{event_class} |
| 528 | @postrefcountsame{stream_class} |
| 529 | @postsuccessrefcountinc{event_class} |
| 530 | @postsuccessfrozen{event_class} |
| 531 | */ |
| 532 | extern int bt_ctf_stream_class_add_event_class( |
| 533 | struct bt_ctf_stream_class *stream_class, |
| 534 | struct bt_ctf_event_class *event_class); |
| 535 | |
| 536 | /** @} */ |
| 537 | |
| 538 | /** |
| 539 | @name Misc. function |
| 540 | @{ |
| 541 | */ |
| 542 | |
| 543 | /** |
| 544 | @brief Accepts the visitor \p visitor to visit the hierarchy of the |
| 545 | CTF IR stream class \p stream_class. |
| 546 | |
| 547 | This function traverses the hierarchy of \p stream_class in pre-order |
| 548 | and calls \p visitor on each element. |
| 549 | |
| 550 | The stream class itself is visited first, and then all its children |
| 551 | event classes. |
| 552 | |
| 553 | @param[in] stream_class Stream class to visit. |
| 554 | @param[in] visitor Visiting function. |
| 555 | @param[in] data User data. |
| 556 | @returns 0 on success, or a negative value on error. |
| 557 | |
| 558 | @prenotnull{stream_class} |
| 559 | @prenotnull{visitor} |
| 560 | */ |
| 561 | extern int bt_ctf_stream_class_visit(struct bt_ctf_stream_class *stream_class, |
| 562 | bt_ctf_visitor visitor, void *data); |
| 563 | |
| 564 | /** @} */ |
| 565 | |
| 566 | /** @} */ |
| 567 | |
| 568 | // TODO: document for writer |
| 569 | extern struct bt_ctf_clock *bt_ctf_stream_class_get_clock( |
| 570 | struct bt_ctf_stream_class *stream_class); |
| 571 | |
| 572 | #ifdef __cplusplus |
| 573 | } |
| 574 | #endif |
| 575 | |
| 576 | #endif /* BABELTRACE_CTF_IR_STREAM_CLASS_H */ |