formats/ctf/writer/writer.c

   1 /*
   2  * writer.c
   3  *
   4  * Babeltrace CTF Writer
   5  *
   6  * Copyright 2013 EfficiOS Inc.
   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-writer/writer.h>
  30 #include <babeltrace/ctf-writer/clock.h>
  31 #include <babeltrace/ctf-writer/clock-internal.h>
  32 #include <babeltrace/ctf-writer/writer-internal.h>
  33 #include <babeltrace/ctf-writer/event-types-internal.h>
  34 #include <babeltrace/ctf-writer/event-fields-internal.h>
  35 #include <babeltrace/ctf-writer/functor-internal.h>
  36 #include <babeltrace/ctf-writer/stream-internal.h>
  37 #include <babeltrace/ctf-writer/stream.h>
  38 #include <babeltrace/compiler.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <sys/stat.h>
  42 #include <errno.h>
  43 #include <unistd.h>
  44 #include <fcntl.h>
  45 #include <inttypes.h>
  46
  47 #define DEFAULT_IDENTIFIER_SIZE 128
  48 #define DEFAULT_METADATA_STRING_SIZE 4096
  49
  50 static
  51 void environment_variable_destroy(struct environment_variable *var);
  52 static
  53 void bt_ctf_writer_destroy(struct bt_ctf_ref *ref);
  54 static
  55 int init_trace_packet_header(struct bt_ctf_writer *writer);
  56 static
  57 int create_stream_file(struct bt_ctf_writer *writer,
  58                 struct bt_ctf_stream *stream);
  59 static
  60 void stream_flush_cb(struct bt_ctf_stream *stream,
  61                 struct bt_ctf_writer *writer);
  62
  63 static
  64 const char * const reserved_keywords_str[] = {"align", "callsite",
  65         "const", "char", "clock", "double", "enum", "env", "event",
  66         "floating_point", "float", "integer", "int", "long", "short", "signed",
  67         "stream", "string", "struct", "trace", "typealias", "typedef",
  68         "unsigned", "variant", "void" "_Bool", "_Complex", "_Imaginary"};
  69
  70 static
  71 const unsigned int field_type_aliases_alignments[] = {
  72         [FIELD_TYPE_ALIAS_UINT5_T] = 1,
  73         [FIELD_TYPE_ALIAS_UINT8_T ... FIELD_TYPE_ALIAS_UINT16_T] = 8,
  74         [FIELD_TYPE_ALIAS_UINT27_T] = 1,
  75         [FIELD_TYPE_ALIAS_UINT32_T ... FIELD_TYPE_ALIAS_UINT64_T] = 8,
  76 };
  77
  78 static
  79 const unsigned int field_type_aliases_sizes[] = {
  80         [FIELD_TYPE_ALIAS_UINT5_T] = 5,
  81         [FIELD_TYPE_ALIAS_UINT8_T] = 8,
  82         [FIELD_TYPE_ALIAS_UINT16_T] = 16,
  83         [FIELD_TYPE_ALIAS_UINT27_T] = 27,
  84         [FIELD_TYPE_ALIAS_UINT32_T] = 32,
  85         [FIELD_TYPE_ALIAS_UINT64_T] = 64,
  86 };
  87
  88 static GHashTable *reserved_keywords_set;
  89 static int init_done;
  90 static int global_data_refcount;
  91
  92 struct bt_ctf_writer *bt_ctf_writer_create(const char *path)
  93 {
  94         struct bt_ctf_writer *writer = NULL;
  95
  96         if (!path) {
  97                 goto error;
  98         }
  99
 100         writer = g_new0(struct bt_ctf_writer, 1);
 101         if (!writer) {
 102                 goto error;
 103         }
 104
 105         bt_ctf_writer_set_byte_order(writer, BT_CTF_BYTE_ORDER_NATIVE);
 106         bt_ctf_ref_init(&writer->ref_count);
 107         writer->path = g_string_new(path);
 108         if (!writer->path) {
 109                 goto error_destroy;
 110         }
 111
 112         /* Create trace directory if necessary and open a metadata file */
 113         if (g_mkdir_with_parents(path, S_IRWXU | S_IRWXG)) {
 114                 perror("g_mkdir_with_parents");
 115                 goto error_destroy;
 116         }
 117
 118         writer->trace_dir_fd = open(path, O_RDONLY | O_DIRECTORY,
 119                 S_IRWXU | S_IRWXG);
 120         if (writer->trace_dir_fd < 0) {
 121                 perror("open");
 122                 goto error_destroy;
 123         }
 124
 125         writer->metadata_fd = openat(writer->trace_dir_fd, "metadata",
 126                 O_WRONLY | O_CREAT | O_TRUNC,
 127                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
 128         writer->environment = g_ptr_array_new_with_free_func(
 129                 (GDestroyNotify)environment_variable_destroy);
 130         writer->clocks = g_ptr_array_new_with_free_func(
 131                 (GDestroyNotify)bt_ctf_clock_put);
 132         writer->streams = g_ptr_array_new_with_free_func(
 133                 (GDestroyNotify)bt_ctf_stream_put);
 134         writer->stream_classes = g_ptr_array_new_with_free_func(
 135                 (GDestroyNotify)bt_ctf_stream_class_put);
 136         if (!writer->environment || !writer->clocks ||
 137                 !writer->stream_classes || !writer->streams) {
 138                 goto error_destroy;
 139         }
 140
 141         /* Generate a trace UUID */
 142         uuid_generate(writer->uuid);
 143         if (init_trace_packet_header(writer)) {
 144                 goto error_destroy;
 145         }
 146
 147         return writer;
 148 error_destroy:
 149         unlinkat(writer->trace_dir_fd, "metadata", 0);
 150         bt_ctf_writer_destroy(&writer->ref_count);
 151         writer = NULL;
 152 error:
 153         return writer;
 154 }
 155
 156 void bt_ctf_writer_destroy(struct bt_ctf_ref *ref)
 157 {
 158         struct bt_ctf_writer *writer;
 159
 160         if (!ref) {
 161                 return;
 162         }
 163
 164         writer = container_of(ref, struct bt_ctf_writer, ref_count);
 165         bt_ctf_writer_flush_metadata(writer);
 166         if (writer->path) {
 167                 g_string_free(writer->path, TRUE);
 168         }
 169
 170         if (writer->trace_dir_fd > 0) {
 171                 close(writer->trace_dir_fd);
 172         }
 173
 174         if (writer->metadata_fd > 0) {
 175                 close(writer->metadata_fd);
 176         }
 177
 178         if (writer->environment) {
 179                 g_ptr_array_free(writer->environment, TRUE);
 180         }
 181
 182         if (writer->clocks) {
 183                 g_ptr_array_free(writer->clocks, TRUE);
 184         }
 185
 186         if (writer->streams) {
 187                 g_ptr_array_free(writer->streams, TRUE);
 188         }
 189
 190         if (writer->stream_classes) {
 191                 g_ptr_array_free(writer->stream_classes, TRUE);
 192         }
 193
 194         bt_ctf_field_type_put(writer->trace_packet_header_type);
 195         bt_ctf_field_put(writer->trace_packet_header);
 196         g_free(writer);
 197 }
 198
 199 struct bt_ctf_stream *bt_ctf_writer_create_stream(struct bt_ctf_writer *writer,
 200                 struct bt_ctf_stream_class *stream_class)
 201 {
 202         int ret;
 203         int stream_class_found = 0;
 204         size_t i;
 205         int stream_fd;
 206         struct bt_ctf_stream *stream = NULL;
 207
 208         if (!writer || !stream_class) {
 209                 goto error;
 210         }
 211
 212         stream = bt_ctf_stream_create(stream_class);
 213         if (!stream) {
 214                 goto error;
 215         }
 216
 217         stream_fd = create_stream_file(writer, stream);
 218         if (stream_fd < 0 || bt_ctf_stream_set_fd(stream, stream_fd)) {
 219                 goto error;
 220         }
 221
 222         bt_ctf_stream_set_flush_callback(stream, (flush_func)stream_flush_cb,
 223                 writer);
 224         ret = bt_ctf_stream_class_set_byte_order(stream->stream_class,
 225                 writer->byte_order == LITTLE_ENDIAN ?
 226                 BT_CTF_BYTE_ORDER_LITTLE_ENDIAN : BT_CTF_BYTE_ORDER_BIG_ENDIAN);
 227         if (ret) {
 228                 goto error;
 229         }
 230
 231         for (i = 0; i < writer->stream_classes->len; i++) {
 232                 if (writer->stream_classes->pdata[i] == stream->stream_class) {
 233                         stream_class_found = 1;
 234                 }
 235         }
 236
 237         if (!stream_class_found) {
 238                 if (bt_ctf_stream_class_set_id(stream->stream_class,
 239                         writer->next_stream_id++)) {
 240                         goto error;
 241                 }
 242
 243                 bt_ctf_stream_class_get(stream->stream_class);
 244                 g_ptr_array_add(writer->stream_classes, stream->stream_class);
 245         }
 246
 247         bt_ctf_stream_get(stream);
 248         g_ptr_array_add(writer->streams, stream);
 249         writer->frozen = 1;
 250         return stream;
 251 error:
 252         bt_ctf_stream_put(stream);
 253         return NULL;
 254 }
 255
 256 int bt_ctf_writer_add_environment_field(struct bt_ctf_writer *writer,
 257                 const char *name,
 258                 const char *value)
 259 {
 260         struct environment_variable *var = NULL;
 261         char *escaped_value = NULL;
 262         int ret = 0;
 263
 264         if (!writer || !name || !value || validate_identifier(name)) {
 265                 ret = -1;
 266                 goto error;
 267         }
 268
 269         if (strchr(name, ' ')) {
 270                 ret = -1;
 271                 goto error;
 272         }
 273
 274         var = g_new0(struct environment_variable, 1);
 275         if (!var) {
 276                 ret = -1;
 277                 goto error;
 278         }
 279
 280         escaped_value = g_strescape(value, NULL);
 281         if (!escaped_value) {
 282                 ret = -1;
 283                 goto error;
 284         }
 285
 286         var->name = g_string_new(name);
 287         var->value = g_string_new(escaped_value);
 288         g_free(escaped_value);
 289         if (!var->name || !var->value) {
 290                 ret = -1;
 291                 goto error;
 292         }
 293
 294         g_ptr_array_add(writer->environment, var);
 295         return ret;
 296
 297 error:
 298         if (var && var->name) {
 299                 g_string_free(var->name, TRUE);
 300         }
 301
 302         if (var && var->value) {
 303                 g_string_free(var->value, TRUE);
 304         }
 305
 306         g_free(var);
 307         return ret;
 308 }
 309
 310 int bt_ctf_writer_add_clock(struct bt_ctf_writer *writer,
 311                 struct bt_ctf_clock *clock)
 312 {
 313         int ret = 0;
 314         struct search_query query = { .value = clock, .found = 0 };
 315
 316         if (!writer || !clock) {
 317                 ret = -1;
 318                 goto end;
 319         }
 320
 321         /* Check for duplicate clocks */
 322         g_ptr_array_foreach(writer->clocks, value_exists, &query);
 323         if (query.found) {
 324                 ret = -1;
 325                 goto end;
 326         }
 327
 328         bt_ctf_clock_get(clock);
 329         g_ptr_array_add(writer->clocks, clock);
 330 end:
 331         return ret;
 332 }
 333
 334 BT_HIDDEN
 335 const char *get_byte_order_string(int byte_order)
 336 {
 337         const char *string;
 338
 339         switch (byte_order) {
 340         case LITTLE_ENDIAN:
 341                 string = "le";
 342                 break;
 343         case BIG_ENDIAN:
 344                 string = "be";
 345                 break;
 346         default:
 347                 string = "unknown";
 348                 break;
 349         }
 350
 351         return string;
 352 }
 353
 354 static
 355 void append_trace_metadata(struct bt_ctf_writer *writer,
 356                 struct metadata_context *context)
 357 {
 358         unsigned char *uuid = writer->uuid;
 359         int ret;
 360
 361         g_string_append(context->string, "trace {\n");
 362
 363         g_string_append(context->string, "\tmajor = 1;\n");
 364         g_string_append(context->string, "\tminor = 8;\n");
 365
 366         g_string_append_printf(context->string,
 367                 "\tuuid = \"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\";\n",
 368                 uuid[0], uuid[1], uuid[2], uuid[3],
 369                 uuid[4], uuid[5], uuid[6], uuid[7],
 370                 uuid[8], uuid[9], uuid[10], uuid[11],
 371                 uuid[12], uuid[13], uuid[14], uuid[15]);
 372         g_string_append_printf(context->string, "\tbyte_order = %s;\n",
 373                 get_byte_order_string(writer->byte_order));
 374
 375         g_string_append(context->string, "\tpacket.header := ");
 376         context->current_indentation_level++;
 377         g_string_assign(context->field_name, "");
 378         ret = bt_ctf_field_type_serialize(writer->trace_packet_header_type,
 379                 context);
 380         assert(!ret);
 381         context->current_indentation_level--;
 382
 383         g_string_append(context->string, ";\n};\n\n");
 384 }
 385
 386 static
 387 void append_env_field_metadata(struct environment_variable *var,
 388                 struct metadata_context *context)
 389 {
 390         g_string_append_printf(context->string, "\t%s = \"%s\";\n",
 391                 var->name->str, var->value->str);
 392 }
 393
 394 static
 395 void append_env_metadata(struct bt_ctf_writer *writer,
 396                 struct metadata_context *context)
 397 {
 398         if (writer->environment->len == 0) {
 399                 return;
 400         }
 401
 402         g_string_append(context->string, "env {\n");
 403         g_ptr_array_foreach(writer->environment,
 404                 (GFunc)append_env_field_metadata, context);
 405         g_string_append(context->string, "};\n\n");
 406 }
 407
 408 char *bt_ctf_writer_get_metadata_string(struct bt_ctf_writer *writer)
 409 {
 410         char *metadata = NULL;
 411         struct metadata_context *context = NULL;
 412         int err = 0;
 413         size_t i;
 414
 415         if (!writer) {
 416                 goto end;
 417         }
 418
 419         context = g_new0(struct metadata_context, 1);
 420         if (!context) {
 421                 goto end;
 422         }
 423
 424         context->field_name = g_string_sized_new(DEFAULT_IDENTIFIER_SIZE);
 425         context->string = g_string_sized_new(DEFAULT_METADATA_STRING_SIZE);
 426         g_string_append(context->string, "/* CTF 1.8 */\n\n");
 427         append_trace_metadata(writer, context);
 428         append_env_metadata(writer, context);
 429         g_ptr_array_foreach(writer->clocks,
 430                 (GFunc)bt_ctf_clock_serialize, context);
 431
 432         for (i = 0; i < writer->stream_classes->len; i++) {
 433                 err = bt_ctf_stream_class_serialize(
 434                         writer->stream_classes->pdata[i], context);
 435                 if (err) {
 436                         goto error;
 437                 }
 438         }
 439
 440         metadata = context->string->str;
 441 error:
 442         g_string_free(context->string, err ? TRUE : FALSE);
 443         g_string_free(context->field_name, TRUE);
 444         g_free(context);
 445 end:
 446         return metadata;
 447 }
 448
 449 void bt_ctf_writer_flush_metadata(struct bt_ctf_writer *writer)
 450 {
 451         int ret;
 452         char *metadata_string = NULL;
 453
 454         if (!writer) {
 455                 goto end;
 456         }
 457
 458         metadata_string = bt_ctf_writer_get_metadata_string(writer);
 459         if (!metadata_string) {
 460                 goto end;
 461         }
 462
 463         if (lseek(writer->metadata_fd, 0, SEEK_SET) == (off_t)-1) {
 464                 perror("lseek");
 465                 goto end;
 466         }
 467
 468         if (ftruncate(writer->metadata_fd, 0)) {
 469                 perror("ftruncate");
 470                 goto end;
 471         }
 472
 473         ret = write(writer->metadata_fd, metadata_string,
 474                 strlen(metadata_string));
 475         if (ret < 0) {
 476                 perror("write");
 477                 goto end;
 478         }
 479 end:
 480         g_free(metadata_string);
 481 }
 482
 483 int bt_ctf_writer_set_byte_order(struct bt_ctf_writer *writer,
 484                 enum bt_ctf_byte_order byte_order)
 485 {
 486         int ret = 0;
 487         int internal_byte_order;
 488
 489         if (!writer || writer->frozen) {
 490                 ret = -1;
 491                 goto end;
 492         }
 493
 494         switch (byte_order) {
 495         case BT_CTF_BYTE_ORDER_NATIVE:
 496                 internal_byte_order =  (G_BYTE_ORDER == G_LITTLE_ENDIAN) ?
 497                         LITTLE_ENDIAN : BIG_ENDIAN;
 498                 break;
 499         case BT_CTF_BYTE_ORDER_LITTLE_ENDIAN:
 500                 internal_byte_order = LITTLE_ENDIAN;
 501                 break;
 502         case BT_CTF_BYTE_ORDER_BIG_ENDIAN:
 503         case BT_CTF_BYTE_ORDER_NETWORK:
 504                 internal_byte_order = BIG_ENDIAN;
 505                 break;
 506         default:
 507                 ret = -1;
 508                 goto end;
 509         }
 510
 511         writer->byte_order = internal_byte_order;
 512         if (writer->trace_packet_header_type ||
 513                 writer->trace_packet_header) {
 514                 init_trace_packet_header(writer);
 515         }
 516 end:
 517         return ret;
 518 }
 519
 520 void bt_ctf_writer_get(struct bt_ctf_writer *writer)
 521 {
 522         if (!writer) {
 523                 return;
 524         }
 525
 526         bt_ctf_ref_get(&writer->ref_count);
 527 }
 528
 529 void bt_ctf_writer_put(struct bt_ctf_writer *writer)
 530 {
 531         if (!writer) {
 532                 return;
 533         }
 534
 535         bt_ctf_ref_put(&writer->ref_count, bt_ctf_writer_destroy);
 536 }
 537
 538 BT_HIDDEN
 539 int validate_identifier(const char *input_string)
 540 {
 541         int ret = 0;
 542         char *string = NULL;
 543         char *save_ptr, *token;
 544
 545         if (!input_string || input_string[0] == '\0') {
 546                 ret = -1;
 547                 goto end;
 548         }
 549
 550         string = strdup(input_string);
 551         if (!string) {
 552                 ret = -1;
 553                 goto end;
 554         }
 555
 556         token = strtok_r(string, " ", &save_ptr);
 557         while (token) {
 558                 if (g_hash_table_contains(reserved_keywords_set,
 559                         GINT_TO_POINTER(g_quark_from_string(token)))) {
 560                         ret = -1;
 561                         goto end;
 562                 }
 563
 564                 token = strtok_r(NULL, " ", &save_ptr);
 565         }
 566 end:
 567         free(string);
 568         return ret;
 569 }
 570
 571 BT_HIDDEN
 572 struct bt_ctf_field_type *get_field_type(enum field_type_alias alias)
 573 {
 574         unsigned int alignment, size;
 575         struct bt_ctf_field_type *field_type;
 576
 577         if (alias >= NR_FIELD_TYPE_ALIAS) {
 578                 return NULL;
 579         }
 580
 581         alignment = field_type_aliases_alignments[alias];
 582         size = field_type_aliases_sizes[alias];
 583         field_type = bt_ctf_field_type_integer_create(size);
 584         bt_ctf_field_type_set_alignment(field_type, alignment);
 585         return field_type;
 586 }
 587
 588 static
 589 int init_trace_packet_header(struct bt_ctf_writer *writer)
 590 {
 591         size_t i;
 592         int ret = 0;
 593         struct bt_ctf_field *trace_packet_header = NULL,
 594                 *magic = NULL, *uuid_array = NULL;
 595         struct bt_ctf_field_type *_uint32_t =
 596                 get_field_type(FIELD_TYPE_ALIAS_UINT32_T);
 597         struct bt_ctf_field_type *_uint8_t =
 598                 get_field_type(FIELD_TYPE_ALIAS_UINT8_T);
 599         struct bt_ctf_field_type *trace_packet_header_type =
 600                 bt_ctf_field_type_structure_create();
 601         struct bt_ctf_field_type *uuid_array_type =
 602                 bt_ctf_field_type_array_create(_uint8_t, 16);
 603
 604         if (!trace_packet_header_type || !uuid_array_type) {
 605                 ret = -1;
 606                 goto end;
 607         }
 608
 609         ret = bt_ctf_field_type_set_byte_order(_uint32_t,
 610                 (writer->byte_order == LITTLE_ENDIAN ?
 611                 BT_CTF_BYTE_ORDER_LITTLE_ENDIAN :
 612                 BT_CTF_BYTE_ORDER_BIG_ENDIAN));
 613         if (ret) {
 614                 goto end;
 615         }
 616
 617         ret = bt_ctf_field_type_structure_add_field(trace_packet_header_type,
 618                 _uint32_t, "magic");
 619         if (ret) {
 620                 goto end;
 621         }
 622
 623         ret = bt_ctf_field_type_structure_add_field(trace_packet_header_type,
 624                 uuid_array_type, "uuid");
 625         if (ret) {
 626                 goto end;
 627         }
 628
 629         ret = bt_ctf_field_type_structure_add_field(trace_packet_header_type,
 630                 _uint32_t, "stream_id");
 631         if (ret) {
 632                 goto end;
 633         }
 634
 635         trace_packet_header = bt_ctf_field_create(trace_packet_header_type);
 636         if (!trace_packet_header) {
 637                 ret = -1;
 638                 goto end;
 639         }
 640
 641         magic = bt_ctf_field_structure_get_field(trace_packet_header, "magic");
 642         ret = bt_ctf_field_unsigned_integer_set_value(magic, 0xC1FC1FC1);
 643         if (ret) {
 644                 goto end;
 645         }
 646
 647         uuid_array = bt_ctf_field_structure_get_field(trace_packet_header,
 648                 "uuid");
 649         for (i = 0; i < 16; i++) {
 650                 struct bt_ctf_field *uuid_element =
 651                         bt_ctf_field_array_get_field(uuid_array, i);
 652                 ret = bt_ctf_field_unsigned_integer_set_value(uuid_element,
 653                         writer->uuid[i]);
 654                 bt_ctf_field_put(uuid_element);
 655                 if (ret) {
 656                         goto end;
 657                 }
 658         }
 659
 660         bt_ctf_field_type_put(writer->trace_packet_header_type);
 661         bt_ctf_field_put(writer->trace_packet_header);
 662         writer->trace_packet_header_type = trace_packet_header_type;
 663         writer->trace_packet_header = trace_packet_header;
 664 end:
 665         bt_ctf_field_type_put(uuid_array_type);
 666         bt_ctf_field_type_put(_uint32_t);
 667         bt_ctf_field_type_put(_uint8_t);
 668         bt_ctf_field_put(magic);
 669         bt_ctf_field_put(uuid_array);
 670         if (ret) {
 671                 bt_ctf_field_type_put(trace_packet_header_type);
 672                 bt_ctf_field_put(trace_packet_header);
 673         }
 674
 675         return ret;
 676 }
 677
 678 static
 679 void environment_variable_destroy(struct environment_variable *var)
 680 {
 681         g_string_free(var->name, TRUE);
 682         g_string_free(var->value, TRUE);
 683         g_free(var);
 684 }
 685
 686 static
 687 int create_stream_file(struct bt_ctf_writer *writer,
 688                 struct bt_ctf_stream *stream)
 689 {
 690         int fd;
 691         GString *filename = g_string_new(stream->stream_class->name->str);
 692
 693         g_string_append_printf(filename, "_%" PRIu32, stream->id);
 694         fd = openat(writer->trace_dir_fd, filename->str,
 695                 O_RDWR | O_CREAT | O_TRUNC,
 696                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
 697         g_string_free(filename, TRUE);
 698         return fd;
 699 }
 700
 701 static
 702 void stream_flush_cb(struct bt_ctf_stream *stream, struct bt_ctf_writer *writer)
 703 {
 704         struct bt_ctf_field *stream_id;
 705
 706         /* Start a new packet in the stream */
 707         if (stream->flushed_packet_count) {
 708                 /* ctf_init_pos has already initialized the first packet */
 709                 ctf_packet_seek(&stream->pos.parent, 0, SEEK_CUR);
 710         }
 711
 712         stream_id = bt_ctf_field_structure_get_field(
 713                 writer->trace_packet_header, "stream_id");
 714         bt_ctf_field_unsigned_integer_set_value(stream_id, stream->id);
 715         bt_ctf_field_put(stream_id);
 716
 717         /* Write the trace_packet_header */
 718         bt_ctf_field_serialize(writer->trace_packet_header, &stream->pos);
 719 }
 720
 721 static __attribute__((constructor))
 722 void writer_init(void)
 723 {
 724         size_t i;
 725         const size_t reserved_keywords_count =
 726                 sizeof(reserved_keywords_str) / sizeof(char *);
 727
 728         global_data_refcount++;
 729         if (init_done) {
 730                 return;
 731         }
 732
 733         reserved_keywords_set = g_hash_table_new(g_direct_hash, g_direct_equal);
 734         for (i = 0; i < reserved_keywords_count; i++) {
 735                 g_hash_table_add(reserved_keywords_set,
 736                 GINT_TO_POINTER(g_quark_from_string(reserved_keywords_str[i])));
 737         }
 738
 739         init_done = 1;
 740 }
 741
 742 static __attribute__((destructor))
 743 void writer_finalize(void)
 744 {
 745         if (--global_data_refcount == 0) {
 746                 g_hash_table_destroy(reserved_keywords_set);
 747         }
 748 }