formats/ctf/ir/stream.c

   1 /*
   2  * stream.c
   3  *
   4  * Babeltrace CTF IR - Stream
   5  *
   6  * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   7  *
   8  * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  26  * SOFTWARE.
  27  */
  28
  29 #include <babeltrace/ctf-ir/clock.h>
  30 #include <babeltrace/ctf-ir/clock-internal.h>
  31 #include <babeltrace/ctf-writer/event.h>
  32 #include <babeltrace/ctf-ir/event-internal.h>
  33 #include <babeltrace/ctf-ir/event-types-internal.h>
  34 #include <babeltrace/ctf-ir/event-fields-internal.h>
  35 #include <babeltrace/ctf-ir/stream.h>
  36 #include <babeltrace/ctf-ir/stream-internal.h>
  37 #include <babeltrace/ctf-ir/stream-class-internal.h>
  38 #include <babeltrace/ref.h>
  39 #include <babeltrace/ctf-writer/functor-internal.h>
  40 #include <babeltrace/compiler.h>
  41 #include <babeltrace/align.h>
  42 #include <babeltrace/ctf/ctf-index.h>
  43
  44 static
  45 void bt_ctf_stream_destroy(struct bt_object *obj);
  46 static
  47 int set_structure_field_integer(struct bt_ctf_field *, char *, uint64_t);
  48
  49 static
  50 int set_packet_header_magic(struct bt_ctf_stream *stream)
  51 {
  52         int ret = 0;
  53         struct bt_ctf_field_type *magic_field_type = NULL;
  54         struct bt_ctf_field *magic_field = bt_ctf_field_structure_get_field(
  55                 stream->packet_header, "magic");
  56
  57         if (!magic_field) {
  58                 /* No magic field found. Not an error, skip. */
  59                 goto end;
  60         }
  61
  62         if (!bt_ctf_field_validate(magic_field)) {
  63                 /* Value already set. Not an error, skip. */
  64                 goto end;
  65         }
  66
  67         magic_field_type = bt_ctf_field_get_type(magic_field);
  68         assert(magic_field_type);
  69
  70         if (bt_ctf_field_type_get_type_id(magic_field_type) !=
  71                 CTF_TYPE_INTEGER) {
  72                 /* Magic field is not an integer. Not an error, skip. */
  73                 goto end;
  74         }
  75
  76         if (bt_ctf_field_type_integer_get_size(magic_field_type) != 32) {
  77                 /*
  78                  * Magic field is not of the expected size.
  79                  * Not an error, skip.
  80                  */
  81                 goto end;
  82         }
  83
  84         ret = bt_ctf_field_type_integer_get_signed(magic_field_type);
  85         assert(ret >= 0);
  86         if (ret) {
  87                 ret = bt_ctf_field_signed_integer_set_value(magic_field,
  88                         (int64_t) 0xC1FC1FC1);
  89         } else {
  90                 ret = bt_ctf_field_unsigned_integer_set_value(magic_field,
  91                         (uint64_t) 0xC1FC1FC1);
  92         }
  93 end:
  94         bt_put(magic_field);
  95         bt_put(magic_field_type);
  96         return ret;
  97 }
  98
  99 static
 100 int set_packet_header_uuid(struct bt_ctf_stream *stream)
 101 {
 102         int i, ret = 0;
 103         struct bt_ctf_field_type *uuid_field_type = NULL;
 104         struct bt_ctf_field_type *element_field_type = NULL;
 105         struct bt_ctf_field *uuid_field = bt_ctf_field_structure_get_field(
 106                 stream->packet_header, "uuid");
 107
 108         if (!uuid_field) {
 109                 /* No uuid field found. Not an error, skip. */
 110                 goto end;
 111         }
 112
 113         if (!bt_ctf_field_validate(uuid_field)) {
 114                 /* Value already set. Not an error, skip. */
 115                 goto end;
 116         }
 117
 118         uuid_field_type = bt_ctf_field_get_type(uuid_field);
 119         assert(uuid_field_type);
 120         if (bt_ctf_field_type_get_type_id(uuid_field_type) !=
 121                 CTF_TYPE_ARRAY) {
 122                 /* UUID field is not an array. Not an error, skip. */
 123                 goto end;
 124         }
 125
 126         if (bt_ctf_field_type_array_get_length(uuid_field_type) != 16) {
 127                 /*
 128                  * UUID field is not of the expected size.
 129                  * Not an error, skip.
 130                  */
 131                 goto end;
 132         }
 133
 134         element_field_type = bt_ctf_field_type_array_get_element_type(
 135                 uuid_field_type);
 136         assert(element_field_type);
 137         if (bt_ctf_field_type_get_type_id(element_field_type) !=
 138                 CTF_TYPE_INTEGER) {
 139                 /* UUID array elements are not integers. Not an error, skip */
 140                 goto end;
 141         }
 142
 143         for (i = 0; i < 16; i++) {
 144                 struct bt_ctf_field *uuid_element =
 145                         bt_ctf_field_array_get_field(uuid_field, i);
 146
 147                 ret = bt_ctf_field_type_integer_get_signed(element_field_type);
 148                 assert(ret >= 0);
 149
 150                 if (ret) {
 151                         ret = bt_ctf_field_signed_integer_set_value(
 152                                 uuid_element, (int64_t) stream->trace->uuid[i]);
 153                 } else {
 154                         ret = bt_ctf_field_unsigned_integer_set_value(
 155                                 uuid_element,
 156                                 (uint64_t) stream->trace->uuid[i]);
 157                 }
 158                 bt_put(uuid_element);
 159                 if (ret) {
 160                         goto end;
 161                 }
 162         }
 163
 164 end:
 165         bt_put(uuid_field);
 166         bt_put(uuid_field_type);
 167         bt_put(element_field_type);
 168         return ret;
 169 }
 170 static
 171 int set_packet_header_stream_id(struct bt_ctf_stream *stream)
 172 {
 173         int ret = 0;
 174         uint32_t stream_id;
 175         struct bt_ctf_field_type *stream_id_field_type = NULL;
 176         struct bt_ctf_field *stream_id_field = bt_ctf_field_structure_get_field(
 177                 stream->packet_header, "stream_id");
 178
 179         if (!stream_id_field) {
 180                 /* No stream_id field found. Not an error, skip. */
 181                 goto end;
 182         }
 183
 184         if (!bt_ctf_field_validate(stream_id_field)) {
 185                 /* Value already set. Not an error, skip. */
 186                 goto end;
 187         }
 188
 189         stream_id_field_type = bt_ctf_field_get_type(stream_id_field);
 190         assert(stream_id_field_type);
 191         if (bt_ctf_field_type_get_type_id(stream_id_field_type) !=
 192                 CTF_TYPE_INTEGER) {
 193                 /* stream_id field is not an integer. Not an error, skip. */
 194                 goto end;
 195         }
 196
 197         stream_id = stream->stream_class->id;
 198         ret = bt_ctf_field_type_integer_get_signed(stream_id_field_type);
 199         assert(ret >= 0);
 200         if (ret) {
 201                 ret = bt_ctf_field_signed_integer_set_value(stream_id_field,
 202                         (int64_t) stream_id);
 203         } else {
 204                 ret = bt_ctf_field_unsigned_integer_set_value(stream_id_field,
 205                         (uint64_t) stream_id);
 206         }
 207 end:
 208         bt_put(stream_id_field);
 209         bt_put(stream_id_field_type);
 210         return ret;
 211 }
 212
 213 static
 214 int set_packet_header(struct bt_ctf_stream *stream)
 215 {
 216         int ret;
 217
 218         ret = set_packet_header_magic(stream);
 219         if (ret) {
 220                 goto end;
 221         }
 222
 223         ret = set_packet_header_uuid(stream);
 224         if (ret) {
 225                 goto end;
 226         }
 227
 228         ret = set_packet_header_stream_id(stream);
 229         if (ret) {
 230                 goto end;
 231         }
 232 end:
 233         return ret;
 234 }
 235
 236 static
 237 void put_event(struct bt_ctf_event *event)
 238 {
 239         bt_ctf_event_set_stream(event, NULL);
 240         bt_put(event);
 241 }
 242
 243 BT_HIDDEN
 244 struct bt_ctf_stream *bt_ctf_stream_create(
 245         struct bt_ctf_stream_class *stream_class,
 246         struct bt_ctf_trace *trace)
 247 {
 248         int ret;
 249         struct bt_ctf_stream *stream = NULL;
 250
 251         if (!stream_class || !trace) {
 252                 goto end;
 253         }
 254
 255         stream = g_new0(struct bt_ctf_stream, 1);
 256         if (!stream) {
 257                 goto end;
 258         }
 259
 260         /* A stream has no ownership of its trace (weak ptr) */
 261         stream->trace = trace;
 262         bt_object_init(stream, bt_ctf_stream_destroy);
 263         stream->packet_context = bt_ctf_field_create(
 264                 stream_class->packet_context_type);
 265         if (!stream->packet_context) {
 266                 goto error;
 267         }
 268
 269         /*
 270          * A stream class may not have a stream event context defined
 271          * in which case this stream will never have a stream_event_context
 272          * member since, after a stream's creation, the parent stream class
 273          * is "frozen" (immutable).
 274          */
 275         if (stream_class->event_context_type) {
 276                 stream->event_context = bt_ctf_field_create(
 277                         stream_class->event_context_type);
 278                 if (!stream->packet_context) {
 279                         goto error;
 280                 }
 281         }
 282
 283         /* Initialize events_discarded */
 284         ret = set_structure_field_integer(stream->packet_context,
 285                 "events_discarded", 0);
 286         if (ret) {
 287                 goto error;
 288         }
 289
 290         stream->pos.fd = -1;
 291         stream->id = stream_class->next_stream_id++;
 292         stream->stream_class = stream_class;
 293         bt_get(stream_class);
 294         stream->events = g_ptr_array_new_with_free_func(
 295                 (GDestroyNotify) put_event);
 296         if (!stream->events) {
 297                 goto error;
 298         }
 299         if (stream_class->event_context_type) {
 300                 stream->event_contexts = g_ptr_array_new_with_free_func(
 301                         (GDestroyNotify) bt_ctf_field_put);
 302                 if (!stream->event_contexts) {
 303                         goto error;
 304                 }
 305         }
 306
 307         /* A trace is not allowed to have a NULL packet header */
 308         assert(trace->packet_header_type);
 309         stream->packet_header = bt_ctf_field_create(trace->packet_header_type);
 310         if (!stream->packet_header) {
 311                 goto error;
 312         }
 313         /*
 314          * Attempt to populate the default trace packet header fields
 315          * (magic, uuid and stream_id). This will _not_ fail shall the
 316          * fields not be found or be of an incompatible type; they will
 317          * simply not be populated automatically. The user will have to
 318          * make sure to set the trace packet header fields himself before
 319          * flushing.
 320          */
 321         ret = set_packet_header(stream);
 322         if (ret) {
 323                 goto error;
 324         }
 325 end:
 326         return stream;
 327 error:
 328         BT_PUT(stream);
 329         return stream;
 330 }
 331
 332 BT_HIDDEN
 333 int bt_ctf_stream_set_fd(struct bt_ctf_stream *stream, int fd)
 334 {
 335         int ret = 0;
 336
 337         if (stream->pos.fd != -1) {
 338                 ret = -1;
 339                 goto end;
 340         }
 341
 342         ctf_init_pos(&stream->pos, NULL, fd, O_RDWR);
 343         stream->pos.fd = fd;
 344 end:
 345         return ret;
 346 }
 347
 348 struct bt_ctf_stream_class *bt_ctf_stream_get_class(
 349                 struct bt_ctf_stream *stream)
 350 {
 351         struct bt_ctf_stream_class *stream_class = NULL;
 352
 353         if (!stream) {
 354                 goto end;
 355         }
 356
 357         stream_class = stream->stream_class;
 358         bt_get(stream_class);
 359 end:
 360         return stream_class;
 361 }
 362
 363 int bt_ctf_stream_get_discarded_events_count(
 364                 struct bt_ctf_stream *stream, uint64_t *count)
 365 {
 366         int64_t ret = 0;
 367         int field_signed;
 368         struct bt_ctf_field *events_discarded_field = NULL;
 369         struct bt_ctf_field_type *events_discarded_field_type = NULL;
 370
 371         if (!stream || !count || !stream->packet_context) {
 372                 ret = -1;
 373                 goto end;
 374         }
 375
 376         events_discarded_field = bt_ctf_field_structure_get_field(
 377                 stream->packet_context, "events_discarded");
 378         if (!events_discarded_field) {
 379                 ret = -1;
 380                 goto end;
 381         }
 382
 383         events_discarded_field_type = bt_ctf_field_get_type(
 384                 events_discarded_field);
 385         if (!events_discarded_field_type) {
 386                 ret = -1;
 387                 goto end;
 388         }
 389
 390         field_signed = bt_ctf_field_type_integer_get_signed(
 391                 events_discarded_field_type);
 392         if (field_signed < 0) {
 393                 ret = field_signed;
 394                 goto end;
 395         }
 396
 397         if (field_signed) {
 398                 int64_t signed_count;
 399
 400                 ret = bt_ctf_field_signed_integer_get_value(
 401                         events_discarded_field, &signed_count);
 402                 if (ret) {
 403                         goto end;
 404                 }
 405                 if (signed_count < 0) {
 406                         /* Invalid value */
 407                         ret = -1;
 408                         goto end;
 409                 }
 410                 *count = (uint64_t) signed_count;
 411         } else {
 412                 ret = bt_ctf_field_unsigned_integer_get_value(
 413                         events_discarded_field, count);
 414                 if (ret) {
 415                         goto end;
 416                 }
 417         }
 418 end:
 419         bt_put(events_discarded_field);
 420         bt_put(events_discarded_field_type);
 421         return ret;
 422 }
 423
 424 void bt_ctf_stream_append_discarded_events(struct bt_ctf_stream *stream,
 425                 uint64_t event_count)
 426 {
 427         int ret;
 428         int field_signed;
 429         uint64_t previous_count;
 430         uint64_t new_count;
 431         struct bt_ctf_field *events_discarded_field = NULL;
 432         struct bt_ctf_field_type *events_discarded_field_type = NULL;
 433
 434         if (!stream || !stream->packet_context) {
 435                 goto end;
 436         }
 437
 438         ret = bt_ctf_stream_get_discarded_events_count(stream,
 439                 &previous_count);
 440         if (ret) {
 441                 goto end;
 442         }
 443
 444         events_discarded_field = bt_ctf_field_structure_get_field(
 445                 stream->packet_context, "events_discarded");
 446         if (!events_discarded_field) {
 447                 goto end;
 448         }
 449
 450         events_discarded_field_type = bt_ctf_field_get_type(
 451                 events_discarded_field);
 452         if (!events_discarded_field_type) {
 453                 goto end;
 454         }
 455
 456         field_signed = bt_ctf_field_type_integer_get_signed(
 457                 events_discarded_field_type);
 458         if (field_signed < 0) {
 459                 goto end;
 460         }
 461
 462         new_count = previous_count + event_count;
 463         if (field_signed) {
 464                 ret = bt_ctf_field_signed_integer_set_value(
 465                         events_discarded_field, (int64_t) new_count);
 466                 if (ret) {
 467                         goto end;
 468                 }
 469         } else {
 470                 ret = bt_ctf_field_unsigned_integer_set_value(
 471                         events_discarded_field, new_count);
 472                 if (ret) {
 473                         goto end;
 474                 }
 475         }
 476
 477 end:
 478         bt_put(events_discarded_field);
 479         bt_put(events_discarded_field_type);
 480 }
 481
 482 int bt_ctf_stream_append_event(struct bt_ctf_stream *stream,
 483                 struct bt_ctf_event *event)
 484 {
 485         int ret = 0;
 486         struct bt_ctf_field *event_context_copy = NULL;
 487
 488         if (!stream || !event) {
 489                 ret = -1;
 490                 goto end;
 491         }
 492
 493         ret = bt_ctf_event_set_stream(event, stream);
 494         if (ret) {
 495                 /* Event was already associated to a stream */
 496                 ret = -1;
 497                 goto end;
 498         }
 499
 500         ret = bt_ctf_event_populate_event_header(event);
 501         if (ret) {
 502                 goto end;
 503         }
 504
 505         /* Make sure the event's payload is set */
 506         ret = bt_ctf_event_validate(event);
 507         if (ret) {
 508                 goto end;
 509         }
 510
 511         /* Sample the current stream event context by copying it */
 512         if (stream->event_context) {
 513                 /* Make sure the event context's payload is set */
 514                 ret = bt_ctf_field_validate(stream->event_context);
 515                 if (ret) {
 516                         goto end;
 517                 }
 518
 519                 event_context_copy = bt_ctf_field_copy(stream->event_context);
 520                 if (!event_context_copy) {
 521                         ret = -1;
 522                         goto end;
 523                 }
 524         }
 525
 526         bt_get(event);
 527         /* Save the new event along with its associated stream event context */
 528         g_ptr_array_add(stream->events, event);
 529         if (event_context_copy) {
 530                 g_ptr_array_add(stream->event_contexts, event_context_copy);
 531         }
 532 end:
 533         if (ret) {
 534                 (void) bt_ctf_event_set_stream(event, NULL);
 535         }
 536         return ret;
 537 }
 538
 539 struct bt_ctf_field *bt_ctf_stream_get_packet_context(
 540                 struct bt_ctf_stream *stream)
 541 {
 542         struct bt_ctf_field *packet_context = NULL;
 543
 544         if (!stream) {
 545                 goto end;
 546         }
 547
 548         packet_context = stream->packet_context;
 549         if (packet_context) {
 550                 bt_get(packet_context);
 551         }
 552 end:
 553         return packet_context;
 554 }
 555
 556 int bt_ctf_stream_set_packet_context(struct bt_ctf_stream *stream,
 557                 struct bt_ctf_field *field)
 558 {
 559         int ret = 0;
 560         struct bt_ctf_field_type *field_type;
 561
 562         if (!stream || !field) {
 563                 ret = -1;
 564                 goto end;
 565         }
 566
 567         field_type = bt_ctf_field_get_type(field);
 568         if (field_type != stream->stream_class->packet_context_type) {
 569                 ret = -1;
 570                 goto end;
 571         }
 572
 573         bt_put(field_type);
 574         bt_get(field);
 575         bt_put(stream->packet_context);
 576         stream->packet_context = field;
 577 end:
 578         return ret;
 579 }
 580
 581 struct bt_ctf_field *bt_ctf_stream_get_event_context(
 582                 struct bt_ctf_stream *stream)
 583 {
 584         struct bt_ctf_field *event_context = NULL;
 585
 586         if (!stream) {
 587                 goto end;
 588         }
 589
 590         event_context = stream->event_context;
 591         if (event_context) {
 592                 bt_get(event_context);
 593         }
 594 end:
 595         return event_context;
 596 }
 597
 598 int bt_ctf_stream_set_event_context(struct bt_ctf_stream *stream,
 599                 struct bt_ctf_field *field)
 600 {
 601         int ret = 0;
 602         struct bt_ctf_field_type *field_type = NULL;
 603
 604         if (!stream || !field) {
 605                 ret = -1;
 606                 goto end;
 607         }
 608
 609         field_type = bt_ctf_field_get_type(field);
 610         if (field_type != stream->stream_class->event_context_type) {
 611                 ret = -1;
 612                 goto end;
 613         }
 614
 615         bt_get(field);
 616         bt_put(stream->event_context);
 617         stream->event_context = field;
 618 end:
 619         bt_put(field_type);
 620         return ret;
 621 }
 622
 623 struct bt_ctf_field *bt_ctf_stream_get_packet_header(
 624                 struct bt_ctf_stream *stream)
 625 {
 626         struct bt_ctf_field *packet_header = NULL;
 627
 628         if (!stream) {
 629                 goto end;
 630         }
 631
 632         packet_header = stream->packet_header;
 633         if (packet_header) {
 634                 bt_get(packet_header);
 635         }
 636 end:
 637         return packet_header;
 638 }
 639
 640 int bt_ctf_stream_set_packet_header(struct bt_ctf_stream *stream,
 641                 struct bt_ctf_field *field)
 642 {
 643         int ret = 0;
 644         struct bt_ctf_field_type *field_type = NULL;
 645
 646         if (!stream || !field) {
 647                 ret = -1;
 648                 goto end;
 649         }
 650
 651         field_type = bt_ctf_field_get_type(field);
 652         if (field_type != stream->trace->packet_header_type) {
 653                 ret = -1;
 654                 goto end;
 655         }
 656
 657         bt_get(field);
 658         bt_put(stream->packet_header);
 659         stream->packet_header = field;
 660 end:
 661         bt_put(field_type);
 662         return ret;
 663 }
 664
 665 static
 666 int get_event_header_timestamp(struct bt_ctf_field *event_header, uint64_t *timestamp)
 667 {
 668         int ret = 0;
 669         struct bt_ctf_field *timestamp_field = NULL;
 670         struct bt_ctf_field_type *timestamp_field_type = NULL;
 671
 672         timestamp_field = bt_ctf_field_structure_get_field(event_header,
 673                 "timestamp");
 674         if (!timestamp_field) {
 675                 ret = -1;
 676                 goto end;
 677         }
 678
 679         timestamp_field_type = bt_ctf_field_get_type(timestamp_field);
 680         assert(timestamp_field_type);
 681         if (bt_ctf_field_type_get_type_id(timestamp_field_type) !=
 682                 CTF_TYPE_INTEGER) {
 683                 ret = -1;
 684                 goto end;
 685         }
 686
 687         if (bt_ctf_field_type_integer_get_signed(timestamp_field_type)) {
 688                 int64_t val;
 689
 690                 ret = bt_ctf_field_signed_integer_get_value(timestamp_field,
 691                         &val);
 692                 if (ret) {
 693                         goto end;
 694                 }
 695                 *timestamp = (uint64_t) val;
 696         } else {
 697                 ret = bt_ctf_field_unsigned_integer_get_value(timestamp_field,
 698                         timestamp);
 699                 if (ret) {
 700                         goto end;
 701                 }
 702         }
 703 end:
 704         bt_put(timestamp_field);
 705         bt_put(timestamp_field_type);
 706         return ret;
 707 }
 708
 709 int bt_ctf_stream_flush(struct bt_ctf_stream *stream)
 710 {
 711         int ret = 0;
 712         size_t i;
 713         uint64_t timestamp_begin, timestamp_end, events_discarded;
 714         struct bt_ctf_field *integer = NULL;
 715         struct ctf_stream_pos packet_context_pos;
 716
 717         if (!stream || stream->pos.fd < 0) {
 718                 /*
 719                  * Stream does not have an associated fd. It is,
 720                  * therefore, not a stream being used to write events.
 721                  */
 722                 ret = -1;
 723                 goto end;
 724         }
 725
 726         if (!stream->events->len) {
 727                 goto end;
 728         }
 729
 730         ret = bt_ctf_field_validate(stream->packet_header);
 731         if (ret) {
 732                 goto end;
 733         }
 734
 735         /* mmap the next packet */
 736         ctf_packet_seek(&stream->pos.parent, 0, SEEK_CUR);
 737
 738         ret = bt_ctf_field_serialize(stream->packet_header, &stream->pos);
 739         if (ret) {
 740                 goto end;
 741         }
 742
 743         /* Set the default context attributes if present and unset. */
 744         if (!get_event_header_timestamp(
 745                 ((struct bt_ctf_event *) g_ptr_array_index(
 746                 stream->events, 0))->event_header, &timestamp_begin)) {
 747                 ret = set_structure_field_integer(stream->packet_context,
 748                         "timestamp_begin", timestamp_begin);
 749                 if (ret) {
 750                         goto end;
 751                 }
 752         }
 753
 754         if (!get_event_header_timestamp(
 755                 ((struct bt_ctf_event *) g_ptr_array_index(
 756                 stream->events, stream->events->len - 1))->event_header,
 757                 &timestamp_end)) {
 758
 759                 ret = set_structure_field_integer(stream->packet_context,
 760                         "timestamp_end", timestamp_end);
 761                 if (ret) {
 762                         goto end;
 763                 }
 764         }
 765         ret = set_structure_field_integer(stream->packet_context,
 766                 "content_size", UINT64_MAX);
 767         if (ret) {
 768                 goto end;
 769         }
 770
 771         ret = set_structure_field_integer(stream->packet_context,
 772                 "packet_size", UINT64_MAX);
 773         if (ret) {
 774                 goto end;
 775         }
 776
 777         /* Write packet context */
 778         memcpy(&packet_context_pos, &stream->pos,
 779                sizeof(struct ctf_stream_pos));
 780         ret = bt_ctf_field_serialize(stream->packet_context,
 781                 &stream->pos);
 782         if (ret) {
 783                 goto end;
 784         }
 785
 786         ret = bt_ctf_stream_get_discarded_events_count(stream,
 787                 &events_discarded);
 788         if (ret) {
 789                 goto end;
 790         }
 791
 792         /* Unset the packet context's fields. */
 793         ret = bt_ctf_field_reset(stream->packet_context);
 794         if (ret) {
 795                 goto end;
 796         }
 797
 798         /* Set the previous number of discarded events. */
 799         ret = set_structure_field_integer(stream->packet_context,
 800                 "events_discarded", events_discarded);
 801         if (ret) {
 802                 goto end;
 803         }
 804
 805         for (i = 0; i < stream->events->len; i++) {
 806                 struct bt_ctf_event *event = g_ptr_array_index(
 807                         stream->events, i);
 808
 809                 ret = bt_ctf_field_reset(event->event_header);
 810                 if (ret) {
 811                         goto end;
 812                 }
 813
 814                 /* Write event header */
 815                 ret = bt_ctf_field_serialize(event->event_header,
 816                         &stream->pos);
 817                 if (ret) {
 818                         goto end;
 819                 }
 820
 821                 /* Write stream event context */
 822                 if (stream->event_contexts) {
 823                         ret = bt_ctf_field_serialize(
 824                                 g_ptr_array_index(stream->event_contexts, i),
 825                                 &stream->pos);
 826                         if (ret) {
 827                                 goto end;
 828                         }
 829                 }
 830
 831                 /* Write event content */
 832                 ret = bt_ctf_event_serialize(event, &stream->pos);
 833                 if (ret) {
 834                         goto end;
 835                 }
 836         }
 837
 838         /*
 839          * Update the packet total size and content size and overwrite the
 840          * packet context.
 841          * Copy base_mma as the packet may have been remapped (e.g. when a
 842          * packet is resized).
 843          */
 844         packet_context_pos.base_mma = stream->pos.base_mma;
 845         ret = set_structure_field_integer(stream->packet_context,
 846                 "content_size", stream->pos.offset);
 847         if (ret) {
 848                 goto end;
 849         }
 850
 851         ret = set_structure_field_integer(stream->packet_context,
 852                 "packet_size", stream->pos.packet_size);
 853         if (ret) {
 854                 goto end;
 855         }
 856
 857         ret = bt_ctf_field_serialize(stream->packet_context,
 858                 &packet_context_pos);
 859         if (ret) {
 860                 goto end;
 861         }
 862
 863         g_ptr_array_set_size(stream->events, 0);
 864         if (stream->event_contexts) {
 865                 g_ptr_array_set_size(stream->event_contexts, 0);
 866         }
 867         stream->flushed_packet_count++;
 868 end:
 869         bt_put(integer);
 870         return ret;
 871 }
 872
 873 void bt_ctf_stream_get(struct bt_ctf_stream *stream)
 874 {
 875         bt_get(stream);
 876 }
 877
 878 void bt_ctf_stream_put(struct bt_ctf_stream *stream)
 879 {
 880         bt_put(stream);
 881 }
 882
 883 static
 884 void bt_ctf_stream_destroy(struct bt_object *obj)
 885 {
 886         struct bt_ctf_stream *stream;
 887
 888         stream = container_of(obj, struct bt_ctf_stream, base);
 889         ctf_fini_pos(&stream->pos);
 890         if (stream->pos.fd >= 0 && close(stream->pos.fd)) {
 891                 perror("close");
 892         }
 893
 894         bt_put(stream->stream_class);
 895         if (stream->events) {
 896                 g_ptr_array_free(stream->events, TRUE);
 897         }
 898         if (stream->event_contexts) {
 899                 g_ptr_array_free(stream->event_contexts, TRUE);
 900         }
 901         bt_put(stream->packet_header);
 902         bt_put(stream->packet_context);
 903         bt_put(stream->event_context);
 904         g_free(stream);
 905 }
 906
 907 static
 908 int set_structure_field_integer(struct bt_ctf_field *structure, char *name,
 909                 uint64_t value)
 910 {
 911         int ret = 0;
 912         struct bt_ctf_field_type *field_type = NULL;
 913         struct bt_ctf_field *integer =
 914                 bt_ctf_field_structure_get_field(structure, name);
 915
 916         if (!structure || !name) {
 917                 ret = -1;
 918                 goto end;
 919         }
 920
 921         if (!integer) {
 922                 /* Field not found, not an error. */
 923                 goto end;
 924         }
 925
 926         /* Make sure the payload has not already been set. */
 927         if (!bt_ctf_field_validate(integer)) {
 928                 /* Payload already set, not an error */
 929                 goto end;
 930         }
 931
 932         field_type = bt_ctf_field_get_type(integer);
 933         /* Something is serioulsly wrong */
 934         assert(field_type);
 935         if (bt_ctf_field_type_get_type_id(field_type) != CTF_TYPE_INTEGER) {
 936                 /*
 937                  * The user most likely meant for us to populate this field
 938                  * automatically. However, we can only do this if the field
 939                  * is an integer. Return an error.
 940                  */
 941                 ret = -1;
 942                 goto end;
 943         }
 944
 945         if (bt_ctf_field_type_integer_get_signed(field_type)) {
 946                 ret = bt_ctf_field_signed_integer_set_value(integer,
 947                         (int64_t) value);
 948         } else {
 949                 ret = bt_ctf_field_unsigned_integer_set_value(integer, value);
 950         }
 951 end:
 952         bt_put(integer);
 953         bt_put(field_type);
 954         return ret;
 955 }