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                         stream->pos.fd < 0) {
 367                 ret = -1;
 368                 goto end;
 369         }
 370
 371         events_discarded_field = bt_ctf_field_structure_get_field(
 372                 stream->packet_context, "events_discarded");
 373         if (!events_discarded_field) {
 374                 ret = -1;
 375                 goto end;
 376         }
 377
 378         events_discarded_field_type = bt_ctf_field_get_type(
 379                 events_discarded_field);
 380         if (!events_discarded_field_type) {
 381                 ret = -1;
 382                 goto end;
 383         }
 384
 385         field_signed = bt_ctf_field_type_integer_get_signed(
 386                 events_discarded_field_type);
 387         if (field_signed < 0) {
 388                 ret = field_signed;
 389                 goto end;
 390         }
 391
 392         if (field_signed) {
 393                 int64_t signed_count;
 394
 395                 ret = bt_ctf_field_signed_integer_get_value(
 396                         events_discarded_field, &signed_count);
 397                 if (ret) {
 398                         goto end;
 399                 }
 400                 if (signed_count < 0) {
 401                         /* Invalid value */
 402                         ret = -1;
 403                         goto end;
 404                 }
 405                 *count = (uint64_t) signed_count;
 406         } else {
 407                 ret = bt_ctf_field_unsigned_integer_get_value(
 408                         events_discarded_field, count);
 409                 if (ret) {
 410                         goto end;
 411                 }
 412         }
 413 end:
 414         bt_put(events_discarded_field);
 415         bt_put(events_discarded_field_type);
 416         return ret;
 417 }
 418
 419 void bt_ctf_stream_append_discarded_events(struct bt_ctf_stream *stream,
 420                 uint64_t event_count)
 421 {
 422         int ret;
 423         int field_signed;
 424         uint64_t previous_count;
 425         uint64_t new_count;
 426         struct bt_ctf_field *events_discarded_field = NULL;
 427         struct bt_ctf_field_type *events_discarded_field_type = NULL;
 428
 429         if (!stream || !stream->packet_context || stream->pos.fd < 0) {
 430                 goto end;
 431         }
 432
 433         ret = bt_ctf_stream_get_discarded_events_count(stream,
 434                 &previous_count);
 435         if (ret) {
 436                 goto end;
 437         }
 438
 439         events_discarded_field = bt_ctf_field_structure_get_field(
 440                 stream->packet_context, "events_discarded");
 441         if (!events_discarded_field) {
 442                 goto end;
 443         }
 444
 445         events_discarded_field_type = bt_ctf_field_get_type(
 446                 events_discarded_field);
 447         if (!events_discarded_field_type) {
 448                 goto end;
 449         }
 450
 451         field_signed = bt_ctf_field_type_integer_get_signed(
 452                 events_discarded_field_type);
 453         if (field_signed < 0) {
 454                 goto end;
 455         }
 456
 457         new_count = previous_count + event_count;
 458         if (field_signed) {
 459                 ret = bt_ctf_field_signed_integer_set_value(
 460                         events_discarded_field, (int64_t) new_count);
 461                 if (ret) {
 462                         goto end;
 463                 }
 464         } else {
 465                 ret = bt_ctf_field_unsigned_integer_set_value(
 466                         events_discarded_field, new_count);
 467                 if (ret) {
 468                         goto end;
 469                 }
 470         }
 471
 472 end:
 473         bt_put(events_discarded_field);
 474         bt_put(events_discarded_field_type);
 475 }
 476
 477 int bt_ctf_stream_append_event(struct bt_ctf_stream *stream,
 478                 struct bt_ctf_event *event)
 479 {
 480         int ret = 0;
 481
 482         if (!stream || !event || stream->pos.fd < 0) {
 483                 ret = -1;
 484                 goto end;
 485         }
 486
 487         bt_object_set_parent(event, stream);
 488         ret = bt_ctf_event_populate_event_header(event);
 489         if (ret) {
 490                 goto end;
 491         }
 492
 493         /* Make sure the various scopes of the event are set */
 494         ret = bt_ctf_event_validate(event);
 495         if (ret) {
 496                 goto end;
 497         }
 498
 499         /* Save the new event and freeze it */
 500         bt_ctf_event_freeze(event);
 501         g_ptr_array_add(stream->events, event);
 502
 503         /*
 504          * Event had to hold a reference to its event class as long as it wasn't
 505          * part of the same trace hierarchy. From now on, the event and its
 506          * class share the same lifetime guarantees and the reference is no
 507          * longer needed.
 508          */
 509         bt_put(event->event_class);
 510 end:
 511         if (ret) {
 512                 /*
 513                  * Orphan the event; we were not succesful in associating it to
 514                  * a stream.
 515                  */
 516                 bt_object_set_parent(event, NULL);
 517         }
 518         return ret;
 519 }
 520
 521 struct bt_ctf_field *bt_ctf_stream_get_packet_context(
 522                 struct bt_ctf_stream *stream)
 523 {
 524         struct bt_ctf_field *packet_context = NULL;
 525
 526         if (!stream || stream->pos.fd < 0) {
 527                 goto end;
 528         }
 529
 530         packet_context = stream->packet_context;
 531         if (packet_context) {
 532                 bt_get(packet_context);
 533         }
 534 end:
 535         return packet_context;
 536 }
 537
 538 int bt_ctf_stream_set_packet_context(struct bt_ctf_stream *stream,
 539                 struct bt_ctf_field *field)
 540 {
 541         int ret = 0;
 542         struct bt_ctf_field_type *field_type;
 543
 544         if (!stream || !field || stream->pos.fd < 0) {
 545                 ret = -1;
 546                 goto end;
 547         }
 548
 549         field_type = bt_ctf_field_get_type(field);
 550         if (bt_ctf_field_type_compare(field_type,
 551                         stream->stream_class->packet_context_type)) {
 552                 ret = -1;
 553                 goto end;
 554         }
 555
 556         bt_put(field_type);
 557         bt_get(field);
 558         bt_put(stream->packet_context);
 559         stream->packet_context = field;
 560 end:
 561         return ret;
 562 }
 563
 564 struct bt_ctf_field *bt_ctf_stream_get_packet_header(
 565                 struct bt_ctf_stream *stream)
 566 {
 567         struct bt_ctf_field *packet_header = NULL;
 568
 569         if (!stream || stream->pos.fd < 0) {
 570                 goto end;
 571         }
 572
 573         packet_header = stream->packet_header;
 574         if (packet_header) {
 575                 bt_get(packet_header);
 576         }
 577 end:
 578         return packet_header;
 579 }
 580
 581 int bt_ctf_stream_set_packet_header(struct bt_ctf_stream *stream,
 582                 struct bt_ctf_field *field)
 583 {
 584         int ret = 0;
 585         struct bt_ctf_trace *trace = NULL;
 586         struct bt_ctf_field_type *field_type = NULL;
 587
 588         if (!stream || !field || stream->pos.fd < 0) {
 589                 ret = -1;
 590                 goto end;
 591         }
 592
 593         trace = (struct bt_ctf_trace *) bt_object_get_parent(stream);
 594         field_type = bt_ctf_field_get_type(field);
 595         if (bt_ctf_field_type_compare(field_type, trace->packet_header_type)) {
 596                 ret = -1;
 597                 goto end;
 598         }
 599
 600         bt_get(field);
 601         bt_put(stream->packet_header);
 602         stream->packet_header = field;
 603 end:
 604         BT_PUT(trace);
 605         bt_put(field_type);
 606         return ret;
 607 }
 608
 609 static
 610 int get_event_header_timestamp(struct bt_ctf_field *event_header, uint64_t *timestamp)
 611 {
 612         int ret = 0;
 613         struct bt_ctf_field *timestamp_field = NULL;
 614         struct bt_ctf_field_type *timestamp_field_type = NULL;
 615
 616         timestamp_field = bt_ctf_field_structure_get_field(event_header,
 617                 "timestamp");
 618         if (!timestamp_field) {
 619                 ret = -1;
 620                 goto end;
 621         }
 622
 623         timestamp_field_type = bt_ctf_field_get_type(timestamp_field);
 624         assert(timestamp_field_type);
 625         if (bt_ctf_field_type_get_type_id(timestamp_field_type) !=
 626                 BT_CTF_TYPE_ID_INTEGER) {
 627                 ret = -1;
 628                 goto end;
 629         }
 630
 631         if (bt_ctf_field_type_integer_get_signed(timestamp_field_type)) {
 632                 int64_t val;
 633
 634                 ret = bt_ctf_field_signed_integer_get_value(timestamp_field,
 635                         &val);
 636                 if (ret) {
 637                         goto end;
 638                 }
 639                 *timestamp = (uint64_t) val;
 640         } else {
 641                 ret = bt_ctf_field_unsigned_integer_get_value(timestamp_field,
 642                         timestamp);
 643                 if (ret) {
 644                         goto end;
 645                 }
 646         }
 647 end:
 648         bt_put(timestamp_field);
 649         bt_put(timestamp_field_type);
 650         return ret;
 651 }
 652
 653 int bt_ctf_stream_flush(struct bt_ctf_stream *stream)
 654 {
 655         int ret = 0;
 656         size_t i;
 657         uint64_t timestamp_begin, timestamp_end, events_discarded;
 658         struct bt_ctf_field *integer = NULL;
 659         struct ctf_stream_pos packet_context_pos;
 660
 661         if (!stream || stream->pos.fd < 0) {
 662                 /*
 663                  * Stream does not have an associated fd. It is,
 664                  * therefore, not a stream being used to write events.
 665                  */
 666                 ret = -1;
 667                 goto end;
 668         }
 669
 670         if (!stream->events->len) {
 671                 goto end;
 672         }
 673
 674         ret = bt_ctf_field_validate(stream->packet_header);
 675         if (ret) {
 676                 goto end;
 677         }
 678
 679         /* mmap the next packet */
 680         ctf_packet_seek(&stream->pos.parent, 0, SEEK_CUR);
 681
 682         ret = bt_ctf_field_serialize(stream->packet_header, &stream->pos);
 683         if (ret) {
 684                 goto end;
 685         }
 686
 687         /* Set the default context attributes if present and unset. */
 688         if (!get_event_header_timestamp(
 689                 ((struct bt_ctf_event *) g_ptr_array_index(
 690                 stream->events, 0))->event_header, &timestamp_begin)) {
 691                 ret = set_structure_field_integer(stream->packet_context,
 692                         "timestamp_begin", timestamp_begin);
 693                 if (ret) {
 694                         goto end;
 695                 }
 696         }
 697
 698         if (!get_event_header_timestamp(
 699                 ((struct bt_ctf_event *) g_ptr_array_index(
 700                 stream->events, stream->events->len - 1))->event_header,
 701                 &timestamp_end)) {
 702
 703                 ret = set_structure_field_integer(stream->packet_context,
 704                         "timestamp_end", timestamp_end);
 705                 if (ret) {
 706                         goto end;
 707                 }
 708         }
 709         ret = set_structure_field_integer(stream->packet_context,
 710                 "content_size", UINT64_MAX);
 711         if (ret) {
 712                 goto end;
 713         }
 714
 715         ret = set_structure_field_integer(stream->packet_context,
 716                 "packet_size", UINT64_MAX);
 717         if (ret) {
 718                 goto end;
 719         }
 720
 721         /* Write packet context */
 722         memcpy(&packet_context_pos, &stream->pos,
 723                sizeof(struct ctf_stream_pos));
 724         ret = bt_ctf_field_serialize(stream->packet_context,
 725                 &stream->pos);
 726         if (ret) {
 727                 goto end;
 728         }
 729
 730         ret = bt_ctf_stream_get_discarded_events_count(stream,
 731                 &events_discarded);
 732         if (ret) {
 733                 goto end;
 734         }
 735
 736         /* Unset the packet context's fields. */
 737         ret = bt_ctf_field_reset(stream->packet_context);
 738         if (ret) {
 739                 goto end;
 740         }
 741
 742         /* Set the previous number of discarded events. */
 743         ret = set_structure_field_integer(stream->packet_context,
 744                 "events_discarded", events_discarded);
 745         if (ret) {
 746                 goto end;
 747         }
 748
 749         for (i = 0; i < stream->events->len; i++) {
 750                 struct bt_ctf_event *event = g_ptr_array_index(
 751                         stream->events, i);
 752
 753                 ret = bt_ctf_field_reset(event->event_header);
 754                 if (ret) {
 755                         goto end;
 756                 }
 757
 758                 /* Write event header */
 759                 ret = bt_ctf_field_serialize(event->event_header,
 760                         &stream->pos);
 761                 if (ret) {
 762                         goto end;
 763                 }
 764
 765                 /* Write stream event context */
 766                 if (event->stream_event_context) {
 767                         ret = bt_ctf_field_serialize(
 768                                 event->stream_event_context, &stream->pos);
 769                         if (ret) {
 770                                 goto end;
 771                         }
 772                 }
 773
 774                 /* Write event content */
 775                 ret = bt_ctf_event_serialize(event, &stream->pos);
 776                 if (ret) {
 777                         goto end;
 778                 }
 779         }
 780
 781         /*
 782          * Update the packet total size and content size and overwrite the
 783          * packet context.
 784          * Copy base_mma as the packet may have been remapped (e.g. when a
 785          * packet is resized).
 786          */
 787         packet_context_pos.base_mma = stream->pos.base_mma;
 788         ret = set_structure_field_integer(stream->packet_context,
 789                 "content_size", stream->pos.offset);
 790         if (ret) {
 791                 goto end;
 792         }
 793
 794         ret = set_structure_field_integer(stream->packet_context,
 795                 "packet_size", stream->pos.packet_size);
 796         if (ret) {
 797                 goto end;
 798         }
 799
 800         ret = bt_ctf_field_serialize(stream->packet_context,
 801                 &packet_context_pos);
 802         if (ret) {
 803                 goto end;
 804         }
 805
 806         g_ptr_array_set_size(stream->events, 0);
 807         stream->flushed_packet_count++;
 808 end:
 809         bt_put(integer);
 810         return ret;
 811 }
 812
 813 void bt_ctf_stream_get(struct bt_ctf_stream *stream)
 814 {
 815         bt_get(stream);
 816 }
 817
 818 void bt_ctf_stream_put(struct bt_ctf_stream *stream)
 819 {
 820         bt_put(stream);
 821 }
 822
 823 static
 824 void bt_ctf_stream_destroy(struct bt_object *obj)
 825 {
 826         struct bt_ctf_stream *stream;
 827
 828         stream = container_of(obj, struct bt_ctf_stream, base);
 829         ctf_fini_pos(&stream->pos);
 830         if (stream->pos.fd >= 0 && close(stream->pos.fd)) {
 831                 perror("close");
 832         }
 833
 834         if (stream->events) {
 835                 g_ptr_array_free(stream->events, TRUE);
 836         }
 837         bt_put(stream->packet_header);
 838         bt_put(stream->packet_context);
 839         bt_put(stream->event_context);
 840         g_free(stream);
 841 }
 842
 843 static
 844 int set_structure_field_integer(struct bt_ctf_field *structure, char *name,
 845                 uint64_t value)
 846 {
 847         int ret = 0;
 848         struct bt_ctf_field_type *field_type = NULL;
 849         struct bt_ctf_field *integer =
 850                 bt_ctf_field_structure_get_field(structure, name);
 851
 852         if (!structure || !name) {
 853                 ret = -1;
 854                 goto end;
 855         }
 856
 857         if (!integer) {
 858                 /* Field not found, not an error. */
 859                 goto end;
 860         }
 861
 862         /* Make sure the payload has not already been set. */
 863         if (!bt_ctf_field_validate(integer)) {
 864                 /* Payload already set, not an error */
 865                 goto end;
 866         }
 867
 868         field_type = bt_ctf_field_get_type(integer);
 869         /* Something is serioulsly wrong */
 870         assert(field_type);
 871         if (bt_ctf_field_type_get_type_id(field_type) != BT_CTF_TYPE_ID_INTEGER) {
 872                 /*
 873                  * The user most likely meant for us to populate this field
 874                  * automatically. However, we can only do this if the field
 875                  * is an integer. Return an error.
 876                  */
 877                 ret = -1;
 878                 goto end;
 879         }
 880
 881         if (bt_ctf_field_type_integer_get_signed(field_type)) {
 882                 ret = bt_ctf_field_signed_integer_set_value(integer,
 883                         (int64_t) value);
 884         } else {
 885                 ret = bt_ctf_field_unsigned_integer_set_value(integer, value);
 886         }
 887 end:
 888         bt_put(integer);
 889         bt_put(field_type);
 890         return ret;
 891 }