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/field-types-internal.h>
  34 #include <babeltrace/ctf-ir/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                 BT_CTF_TYPE_ID_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_trace *trace = NULL;
 104         struct bt_ctf_field_type *uuid_field_type = NULL;
 105         struct bt_ctf_field_type *element_field_type = NULL;
 106         struct bt_ctf_field *uuid_field = bt_ctf_field_structure_get_field(
 107                 stream->packet_header, "uuid");
 108
 109         if (!uuid_field) {
 110                 /* No uuid field found. Not an error, skip. */
 111                 goto end;
 112         }
 113
 114         if (!bt_ctf_field_validate(uuid_field)) {
 115                 /* Value already set. Not an error, skip. */
 116                 goto end;
 117         }
 118
 119         uuid_field_type = bt_ctf_field_get_type(uuid_field);
 120         assert(uuid_field_type);
 121         if (bt_ctf_field_type_get_type_id(uuid_field_type) !=
 122                 BT_CTF_TYPE_ID_ARRAY) {
 123                 /* UUID field is not an array. Not an error, skip. */
 124                 goto end;
 125         }
 126
 127         if (bt_ctf_field_type_array_get_length(uuid_field_type) != 16) {
 128                 /*
 129                  * UUID field is not of the expected size.
 130                  * Not an error, skip.
 131                  */
 132                 goto end;
 133         }
 134
 135         element_field_type = bt_ctf_field_type_array_get_element_type(
 136                 uuid_field_type);
 137         assert(element_field_type);
 138         if (bt_ctf_field_type_get_type_id(element_field_type) !=
 139                 BT_CTF_TYPE_ID_INTEGER) {
 140                 /* UUID array elements are not integers. Not an error, skip */
 141                 goto end;
 142         }
 143
 144         trace = (struct bt_ctf_trace *) bt_object_get_parent(stream);
 145         for (i = 0; i < 16; i++) {
 146                 struct bt_ctf_field *uuid_element =
 147                         bt_ctf_field_array_get_field(uuid_field, i);
 148
 149                 ret = bt_ctf_field_type_integer_get_signed(element_field_type);
 150                 assert(ret >= 0);
 151
 152                 if (ret) {
 153                         ret = bt_ctf_field_signed_integer_set_value(
 154                                 uuid_element, (int64_t) trace->uuid[i]);
 155                 } else {
 156                         ret = bt_ctf_field_unsigned_integer_set_value(
 157                                 uuid_element,
 158                                 (uint64_t) trace->uuid[i]);
 159                 }
 160                 bt_put(uuid_element);
 161                 if (ret) {
 162                         goto end;
 163                 }
 164         }
 165
 166 end:
 167         bt_put(uuid_field);
 168         bt_put(uuid_field_type);
 169         bt_put(element_field_type);
 170         BT_PUT(trace);
 171         return ret;
 172 }
 173 static
 174 int set_packet_header_stream_id(struct bt_ctf_stream *stream)
 175 {
 176         int ret = 0;
 177         uint32_t stream_id;
 178         struct bt_ctf_field_type *stream_id_field_type = NULL;
 179         struct bt_ctf_field *stream_id_field = bt_ctf_field_structure_get_field(
 180                 stream->packet_header, "stream_id");
 181
 182         if (!stream_id_field) {
 183                 /* No stream_id field found. Not an error, skip. */
 184                 goto end;
 185         }
 186
 187         if (!bt_ctf_field_validate(stream_id_field)) {
 188                 /* Value already set. Not an error, skip. */
 189                 goto end;
 190         }
 191
 192         stream_id_field_type = bt_ctf_field_get_type(stream_id_field);
 193         assert(stream_id_field_type);
 194         if (bt_ctf_field_type_get_type_id(stream_id_field_type) !=
 195                 BT_CTF_TYPE_ID_INTEGER) {
 196                 /* stream_id field is not an integer. Not an error, skip. */
 197                 goto end;
 198         }
 199
 200         stream_id = stream->stream_class->id;
 201         ret = bt_ctf_field_type_integer_get_signed(stream_id_field_type);
 202         assert(ret >= 0);
 203         if (ret) {
 204                 ret = bt_ctf_field_signed_integer_set_value(stream_id_field,
 205                         (int64_t) stream_id);
 206         } else {
 207                 ret = bt_ctf_field_unsigned_integer_set_value(stream_id_field,
 208                         (uint64_t) stream_id);
 209         }
 210 end:
 211         bt_put(stream_id_field);
 212         bt_put(stream_id_field_type);
 213         return ret;
 214 }
 215
 216 static
 217 int set_packet_header(struct bt_ctf_stream *stream)
 218 {
 219         int ret;
 220
 221         ret = set_packet_header_magic(stream);
 222         if (ret) {
 223                 goto end;
 224         }
 225
 226         ret = set_packet_header_uuid(stream);
 227         if (ret) {
 228                 goto end;
 229         }
 230
 231         ret = set_packet_header_stream_id(stream);
 232         if (ret) {
 233                 goto end;
 234         }
 235 end:
 236         return ret;
 237 }
 238
 239 static
 240 void release_event(struct bt_ctf_event *event)
 241 {
 242         if (bt_object_get_ref_count(event)) {
 243                 /*
 244                  * The event is being orphaned, but it must guarantee the
 245                  * existence of its event class for the duration of its
 246                  * lifetime.
 247                  */
 248                 bt_get(event->event_class);
 249                 BT_PUT(event->base.parent);
 250         } else {
 251                 bt_object_release(event);
 252         }
 253 }
 254
 255 BT_HIDDEN
 256 struct bt_ctf_stream *bt_ctf_stream_create(
 257         struct bt_ctf_stream_class *stream_class,
 258         struct bt_ctf_trace *trace)
 259 {
 260         int ret;
 261         struct bt_ctf_stream *stream = NULL;
 262
 263         if (!stream_class || !trace) {
 264                 goto end;
 265         }
 266
 267         stream = g_new0(struct bt_ctf_stream, 1);
 268         if (!stream) {
 269                 goto end;
 270         }
 271
 272         bt_object_init(stream, bt_ctf_stream_destroy);
 273         /*
 274          * Acquire reference to parent since stream will become publicly
 275          * reachable; it needs its parent to remain valid.
 276          */
 277         bt_object_set_parent(stream, trace);
 278         stream->packet_context = bt_ctf_field_create(
 279                 stream_class->packet_context_type);
 280         if (!stream->packet_context) {
 281                 goto error;
 282         }
 283
 284         /* Initialize events_discarded */
 285         ret = set_structure_field_integer(stream->packet_context,
 286                 "events_discarded", 0);
 287         if (ret) {
 288                 goto error;
 289         }
 290
 291         stream->pos.fd = -1;
 292         stream->id = stream_class->next_stream_id++;
 293         stream->stream_class = stream_class;
 294         stream->events = g_ptr_array_new_with_free_func(
 295                 (GDestroyNotify) release_event);
 296         if (!stream->events) {
 297                 goto error;
 298         }
 299
 300         /* A trace is not allowed to have a NULL packet header */
 301         assert(trace->packet_header_type);
 302         stream->packet_header = bt_ctf_field_create(trace->packet_header_type);
 303         if (!stream->packet_header) {
 304                 goto error;
 305         }
 306         /*
 307          * Attempt to populate the default trace packet header fields
 308          * (magic, uuid and stream_id). This will _not_ fail shall the
 309          * fields not be found or be of an incompatible type; they will
 310          * simply not be populated automatically. The user will have to
 311          * make sure to set the trace packet header fields himself before
 312          * flushing.
 313          */
 314         ret = set_packet_header(stream);
 315         if (ret) {
 316                 goto error;
 317         }
 318 end:
 319         return stream;
 320 error:
 321         BT_PUT(stream);
 322         bt_put(trace);
 323         return stream;
 324 }
 325
 326 BT_HIDDEN
 327 int bt_ctf_stream_set_fd(struct bt_ctf_stream *stream, int fd)
 328 {
 329         int ret = 0;
 330
 331         if (stream->pos.fd != -1) {
 332                 ret = -1;
 333                 goto end;
 334         }
 335
 336         ctf_init_pos(&stream->pos, NULL, fd, O_RDWR);
 337         stream->pos.fd = fd;
 338 end:
 339         return ret;
 340 }
 341
 342 struct bt_ctf_stream_class *bt_ctf_stream_get_class(
 343                 struct bt_ctf_stream *stream)
 344 {
 345         struct bt_ctf_stream_class *stream_class = NULL;
 346
 347         if (!stream) {
 348                 goto end;
 349         }
 350
 351         stream_class = stream->stream_class;
 352         bt_get(stream_class);
 353 end:
 354         return stream_class;
 355 }
 356
 357 int bt_ctf_stream_get_discarded_events_count(
 358                 struct bt_ctf_stream *stream, uint64_t *count)
 359 {
 360         int64_t ret = 0;
 361         int field_signed;
 362         struct bt_ctf_field *events_discarded_field = NULL;
 363         struct bt_ctf_field_type *events_discarded_field_type = NULL;
 364
 365         if (!stream || !count || !stream->packet_context) {
 366                 ret = -1;
 367                 goto end;
 368         }
 369
 370         events_discarded_field = bt_ctf_field_structure_get_field(
 371                 stream->packet_context, "events_discarded");
 372         if (!events_discarded_field) {
 373                 ret = -1;
 374                 goto end;
 375         }
 376
 377         events_discarded_field_type = bt_ctf_field_get_type(
 378                 events_discarded_field);
 379         if (!events_discarded_field_type) {
 380                 ret = -1;
 381                 goto end;
 382         }
 383
 384         field_signed = bt_ctf_field_type_integer_get_signed(
 385                 events_discarded_field_type);
 386         if (field_signed < 0) {
 387                 ret = field_signed;
 388                 goto end;
 389         }
 390
 391         if (field_signed) {
 392                 int64_t signed_count;
 393
 394                 ret = bt_ctf_field_signed_integer_get_value(
 395                         events_discarded_field, &signed_count);
 396                 if (ret) {
 397                         goto end;
 398                 }
 399                 if (signed_count < 0) {
 400                         /* Invalid value */
 401                         ret = -1;
 402                         goto end;
 403                 }
 404                 *count = (uint64_t) signed_count;
 405         } else {
 406                 ret = bt_ctf_field_unsigned_integer_get_value(
 407                         events_discarded_field, count);
 408                 if (ret) {
 409                         goto end;
 410                 }
 411         }
 412 end:
 413         bt_put(events_discarded_field);
 414         bt_put(events_discarded_field_type);
 415         return ret;
 416 }
 417
 418 void bt_ctf_stream_append_discarded_events(struct bt_ctf_stream *stream,
 419                 uint64_t event_count)
 420 {
 421         int ret;
 422         int field_signed;
 423         uint64_t previous_count;
 424         uint64_t new_count;
 425         struct bt_ctf_field *events_discarded_field = NULL;
 426         struct bt_ctf_field_type *events_discarded_field_type = NULL;
 427
 428         if (!stream || !stream->packet_context) {
 429                 goto end;
 430         }
 431
 432         ret = bt_ctf_stream_get_discarded_events_count(stream,
 433                 &previous_count);
 434         if (ret) {
 435                 goto end;
 436         }
 437
 438         events_discarded_field = bt_ctf_field_structure_get_field(
 439                 stream->packet_context, "events_discarded");
 440         if (!events_discarded_field) {
 441                 goto end;
 442         }
 443
 444         events_discarded_field_type = bt_ctf_field_get_type(
 445                 events_discarded_field);
 446         if (!events_discarded_field_type) {
 447                 goto end;
 448         }
 449
 450         field_signed = bt_ctf_field_type_integer_get_signed(
 451                 events_discarded_field_type);
 452         if (field_signed < 0) {
 453                 goto end;
 454         }
 455
 456         new_count = previous_count + event_count;
 457         if (field_signed) {
 458                 ret = bt_ctf_field_signed_integer_set_value(
 459                         events_discarded_field, (int64_t) new_count);
 460                 if (ret) {
 461                         goto end;
 462                 }
 463         } else {
 464                 ret = bt_ctf_field_unsigned_integer_set_value(
 465                         events_discarded_field, new_count);
 466                 if (ret) {
 467                         goto end;
 468                 }
 469         }
 470
 471 end:
 472         bt_put(events_discarded_field);
 473         bt_put(events_discarded_field_type);
 474 }
 475
 476 int bt_ctf_stream_append_event(struct bt_ctf_stream *stream,
 477                 struct bt_ctf_event *event)
 478 {
 479         int ret = 0;
 480
 481         if (!stream || !event) {
 482                 ret = -1;
 483                 goto end;
 484         }
 485
 486         bt_object_set_parent(event, stream);
 487         ret = bt_ctf_event_populate_event_header(event);
 488         if (ret) {
 489                 goto end;
 490         }
 491
 492         /* Make sure the various scopes of the event are set */
 493         ret = bt_ctf_event_validate(event);
 494         if (ret) {
 495                 goto end;
 496         }
 497
 498         /* Save the new event and freeze it */
 499         bt_ctf_event_freeze(event);
 500         g_ptr_array_add(stream->events, event);
 501
 502         /*
 503          * Event had to hold a reference to its event class as long as it wasn't
 504          * part of the same trace hierarchy. From now on, the event and its
 505          * class share the same lifetime guarantees and the reference is no
 506          * longer needed.
 507          */
 508         bt_put(event->event_class);
 509 end:
 510         if (ret) {
 511                 /*
 512                  * Orphan the event; we were not succesful in associating it to
 513                  * a stream.
 514                  */
 515                 bt_object_set_parent(event, NULL);
 516         }
 517         return ret;
 518 }
 519
 520 struct bt_ctf_field *bt_ctf_stream_get_packet_context(
 521                 struct bt_ctf_stream *stream)
 522 {
 523         struct bt_ctf_field *packet_context = NULL;
 524
 525         if (!stream) {
 526                 goto end;
 527         }
 528
 529         packet_context = stream->packet_context;
 530         if (packet_context) {
 531                 bt_get(packet_context);
 532         }
 533 end:
 534         return packet_context;
 535 }
 536
 537 int bt_ctf_stream_set_packet_context(struct bt_ctf_stream *stream,
 538                 struct bt_ctf_field *field)
 539 {
 540         int ret = 0;
 541         struct bt_ctf_field_type *field_type;
 542
 543         if (!stream || !field) {
 544                 ret = -1;
 545                 goto end;
 546         }
 547
 548         field_type = bt_ctf_field_get_type(field);
 549         if (bt_ctf_field_type_compare(field_type,
 550                         stream->stream_class->packet_context_type)) {
 551                 ret = -1;
 552                 goto end;
 553         }
 554
 555         bt_put(field_type);
 556         bt_get(field);
 557         bt_put(stream->packet_context);
 558         stream->packet_context = field;
 559 end:
 560         return ret;
 561 }
 562
 563 struct bt_ctf_field *bt_ctf_stream_get_packet_header(
 564                 struct bt_ctf_stream *stream)
 565 {
 566         struct bt_ctf_field *packet_header = NULL;
 567
 568         if (!stream) {
 569                 goto end;
 570         }
 571
 572         packet_header = stream->packet_header;
 573         if (packet_header) {
 574                 bt_get(packet_header);
 575         }
 576 end:
 577         return packet_header;
 578 }
 579
 580 int bt_ctf_stream_set_packet_header(struct bt_ctf_stream *stream,
 581                 struct bt_ctf_field *field)
 582 {
 583         int ret = 0;
 584         struct bt_ctf_trace *trace = NULL;
 585         struct bt_ctf_field_type *field_type = NULL;
 586
 587         if (!stream || !field) {
 588                 ret = -1;
 589                 goto end;
 590         }
 591
 592         trace = (struct bt_ctf_trace *) bt_object_get_parent(stream);
 593         field_type = bt_ctf_field_get_type(field);
 594         if (bt_ctf_field_type_compare(field_type, trace->packet_header_type)) {
 595                 ret = -1;
 596                 goto end;
 597         }
 598
 599         bt_get(field);
 600         bt_put(stream->packet_header);
 601         stream->packet_header = field;
 602 end:
 603         BT_PUT(trace);
 604         bt_put(field_type);
 605         return ret;
 606 }
 607
 608 static
 609 int get_event_header_timestamp(struct bt_ctf_field *event_header, uint64_t *timestamp)
 610 {
 611         int ret = 0;
 612         struct bt_ctf_field *timestamp_field = NULL;
 613         struct bt_ctf_field_type *timestamp_field_type = NULL;
 614
 615         timestamp_field = bt_ctf_field_structure_get_field(event_header,
 616                 "timestamp");
 617         if (!timestamp_field) {
 618                 ret = -1;
 619                 goto end;
 620         }
 621
 622         timestamp_field_type = bt_ctf_field_get_type(timestamp_field);
 623         assert(timestamp_field_type);
 624         if (bt_ctf_field_type_get_type_id(timestamp_field_type) !=
 625                 BT_CTF_TYPE_ID_INTEGER) {
 626                 ret = -1;
 627                 goto end;
 628         }
 629
 630         if (bt_ctf_field_type_integer_get_signed(timestamp_field_type)) {
 631                 int64_t val;
 632
 633                 ret = bt_ctf_field_signed_integer_get_value(timestamp_field,
 634                         &val);
 635                 if (ret) {
 636                         goto end;
 637                 }
 638                 *timestamp = (uint64_t) val;
 639         } else {
 640                 ret = bt_ctf_field_unsigned_integer_get_value(timestamp_field,
 641                         timestamp);
 642                 if (ret) {
 643                         goto end;
 644                 }
 645         }
 646 end:
 647         bt_put(timestamp_field);
 648         bt_put(timestamp_field_type);
 649         return ret;
 650 }
 651
 652 int bt_ctf_stream_flush(struct bt_ctf_stream *stream)
 653 {
 654         int ret = 0;
 655         size_t i;
 656         uint64_t timestamp_begin, timestamp_end, events_discarded;
 657         struct bt_ctf_field *integer = NULL;
 658         struct ctf_stream_pos packet_context_pos;
 659
 660         if (!stream || stream->pos.fd < 0) {
 661                 /*
 662                  * Stream does not have an associated fd. It is,
 663                  * therefore, not a stream being used to write events.
 664                  */
 665                 ret = -1;
 666                 goto end;
 667         }
 668
 669         if (!stream->events->len) {
 670                 goto end;
 671         }
 672
 673         ret = bt_ctf_field_validate(stream->packet_header);
 674         if (ret) {
 675                 goto end;
 676         }
 677
 678         /* mmap the next packet */
 679         ctf_packet_seek(&stream->pos.parent, 0, SEEK_CUR);
 680
 681         ret = bt_ctf_field_serialize(stream->packet_header, &stream->pos);
 682         if (ret) {
 683                 goto end;
 684         }
 685
 686         /* Set the default context attributes if present and unset. */
 687         if (!get_event_header_timestamp(
 688                 ((struct bt_ctf_event *) g_ptr_array_index(
 689                 stream->events, 0))->event_header, &timestamp_begin)) {
 690                 ret = set_structure_field_integer(stream->packet_context,
 691                         "timestamp_begin", timestamp_begin);
 692                 if (ret) {
 693                         goto end;
 694                 }
 695         }
 696
 697         if (!get_event_header_timestamp(
 698                 ((struct bt_ctf_event *) g_ptr_array_index(
 699                 stream->events, stream->events->len - 1))->event_header,
 700                 &timestamp_end)) {
 701
 702                 ret = set_structure_field_integer(stream->packet_context,
 703                         "timestamp_end", timestamp_end);
 704                 if (ret) {
 705                         goto end;
 706                 }
 707         }
 708         ret = set_structure_field_integer(stream->packet_context,
 709                 "content_size", UINT64_MAX);
 710         if (ret) {
 711                 goto end;
 712         }
 713
 714         ret = set_structure_field_integer(stream->packet_context,
 715                 "packet_size", UINT64_MAX);
 716         if (ret) {
 717                 goto end;
 718         }
 719
 720         /* Write packet context */
 721         memcpy(&packet_context_pos, &stream->pos,
 722                sizeof(struct ctf_stream_pos));
 723         ret = bt_ctf_field_serialize(stream->packet_context,
 724                 &stream->pos);
 725         if (ret) {
 726                 goto end;
 727         }
 728
 729         ret = bt_ctf_stream_get_discarded_events_count(stream,
 730                 &events_discarded);
 731         if (ret) {
 732                 goto end;
 733         }
 734
 735         /* Unset the packet context's fields. */
 736         ret = bt_ctf_field_reset(stream->packet_context);
 737         if (ret) {
 738                 goto end;
 739         }
 740
 741         /* Set the previous number of discarded events. */
 742         ret = set_structure_field_integer(stream->packet_context,
 743                 "events_discarded", events_discarded);
 744         if (ret) {
 745                 goto end;
 746         }
 747
 748         for (i = 0; i < stream->events->len; i++) {
 749                 struct bt_ctf_event *event = g_ptr_array_index(
 750                         stream->events, i);
 751
 752                 ret = bt_ctf_field_reset(event->event_header);
 753                 if (ret) {
 754                         goto end;
 755                 }
 756
 757                 /* Write event header */
 758                 ret = bt_ctf_field_serialize(event->event_header,
 759                         &stream->pos);
 760                 if (ret) {
 761                         goto end;
 762                 }
 763
 764                 /* Write stream event context */
 765                 if (event->stream_event_context) {
 766                         ret = bt_ctf_field_serialize(
 767                                 event->stream_event_context, &stream->pos);
 768                         if (ret) {
 769                                 goto end;
 770                         }
 771                 }
 772
 773                 /* Write event content */
 774                 ret = bt_ctf_event_serialize(event, &stream->pos);
 775                 if (ret) {
 776                         goto end;
 777                 }
 778         }
 779
 780         /*
 781          * Update the packet total size and content size and overwrite the
 782          * packet context.
 783          * Copy base_mma as the packet may have been remapped (e.g. when a
 784          * packet is resized).
 785          */
 786         packet_context_pos.base_mma = stream->pos.base_mma;
 787         ret = set_structure_field_integer(stream->packet_context,
 788                 "content_size", stream->pos.offset);
 789         if (ret) {
 790                 goto end;
 791         }
 792
 793         ret = set_structure_field_integer(stream->packet_context,
 794                 "packet_size", stream->pos.packet_size);
 795         if (ret) {
 796                 goto end;
 797         }
 798
 799         ret = bt_ctf_field_serialize(stream->packet_context,
 800                 &packet_context_pos);
 801         if (ret) {
 802                 goto end;
 803         }
 804
 805         g_ptr_array_set_size(stream->events, 0);
 806         stream->flushed_packet_count++;
 807 end:
 808         bt_put(integer);
 809         return ret;
 810 }
 811
 812 void bt_ctf_stream_get(struct bt_ctf_stream *stream)
 813 {
 814         bt_get(stream);
 815 }
 816
 817 void bt_ctf_stream_put(struct bt_ctf_stream *stream)
 818 {
 819         bt_put(stream);
 820 }
 821
 822 static
 823 void bt_ctf_stream_destroy(struct bt_object *obj)
 824 {
 825         struct bt_ctf_stream *stream;
 826
 827         stream = container_of(obj, struct bt_ctf_stream, base);
 828         ctf_fini_pos(&stream->pos);
 829         if (stream->pos.fd >= 0 && close(stream->pos.fd)) {
 830                 perror("close");
 831         }
 832
 833         if (stream->events) {
 834                 g_ptr_array_free(stream->events, TRUE);
 835         }
 836         bt_put(stream->packet_header);
 837         bt_put(stream->packet_context);
 838         bt_put(stream->event_context);
 839         g_free(stream);
 840 }
 841
 842 static
 843 int set_structure_field_integer(struct bt_ctf_field *structure, char *name,
 844                 uint64_t value)
 845 {
 846         int ret = 0;
 847         struct bt_ctf_field_type *field_type = NULL;
 848         struct bt_ctf_field *integer =
 849                 bt_ctf_field_structure_get_field(structure, name);
 850
 851         if (!structure || !name) {
 852                 ret = -1;
 853                 goto end;
 854         }
 855
 856         if (!integer) {
 857                 /* Field not found, not an error. */
 858                 goto end;
 859         }
 860
 861         /* Make sure the payload has not already been set. */
 862         if (!bt_ctf_field_validate(integer)) {
 863                 /* Payload already set, not an error */
 864                 goto end;
 865         }
 866
 867         field_type = bt_ctf_field_get_type(integer);
 868         /* Something is serioulsly wrong */
 869         assert(field_type);
 870         if (bt_ctf_field_type_get_type_id(field_type) != BT_CTF_TYPE_ID_INTEGER) {
 871                 /*
 872                  * The user most likely meant for us to populate this field
 873                  * automatically. However, we can only do this if the field
 874                  * is an integer. Return an error.
 875                  */
 876                 ret = -1;
 877                 goto end;
 878         }
 879
 880         if (bt_ctf_field_type_integer_get_signed(field_type)) {
 881                 ret = bt_ctf_field_signed_integer_set_value(integer,
 882                         (int64_t) value);
 883         } else {
 884                 ret = bt_ctf_field_unsigned_integer_set_value(integer, value);
 885         }
 886 end:
 887         bt_put(integer);
 888         bt_put(field_type);
 889         return ret;
 890 }