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         g_string_append(context->string, "trace {\n");
 359
 360         g_string_append(context->string, "\tmajor = 1;\n");
 361         g_string_append(context->string, "\tminor = 8;\n");
 362
 363         unsigned char *uuid = writer->uuid;
 364         g_string_append_printf(context->string,
 365                 "\tuuid = \"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\";\n",
 366                 uuid[0], uuid[1], uuid[2], uuid[3],
 367                 uuid[4], uuid[5], uuid[6], uuid[7],
 368                 uuid[8], uuid[9], uuid[10], uuid[11],
 369                 uuid[12], uuid[13], uuid[14], uuid[15]);
 370         g_string_append_printf(context->string, "\tbyte_order = %s;\n",
 371                 get_byte_order_string(writer->byte_order));
 372
 373         g_string_append(context->string, "\tpacket.header := ");
 374         context->current_indentation_level++;
 375         g_string_assign(context->field_name, "");
 376         bt_ctf_field_type_serialize(writer->trace_packet_header_type, context);
 377         context->current_indentation_level--;
 378
 379         g_string_append(context->string, ";\n};\n\n");
 380 }
 381
 382 static
 383 void append_env_field_metadata(struct environment_variable *var,
 384                 struct metadata_context *context)
 385 {
 386         g_string_append_printf(context->string, "\t%s = \"%s\";\n",
 387                 var->name->str, var->value->str);
 388 }
 389
 390 static
 391 void append_env_metadata(struct bt_ctf_writer *writer,
 392                 struct metadata_context *context)
 393 {
 394         if (writer->environment->len == 0) {
 395                 return;
 396         }
 397
 398         g_string_append(context->string, "env {\n");
 399         g_ptr_array_foreach(writer->environment,
 400                 (GFunc)append_env_field_metadata, context);
 401         g_string_append(context->string, "};\n\n");
 402 }
 403
 404 char *bt_ctf_writer_get_metadata_string(struct bt_ctf_writer *writer)
 405 {
 406         char *metadata = NULL;
 407         struct metadata_context *context = NULL;
 408         int err = 0;
 409         size_t i;
 410
 411         if (!writer) {
 412                 goto end;
 413         }
 414
 415         context = g_new0(struct metadata_context, 1);
 416         if (!context) {
 417                 goto end;
 418         }
 419
 420         context->field_name = g_string_sized_new(DEFAULT_IDENTIFIER_SIZE);
 421         context->string = g_string_sized_new(DEFAULT_METADATA_STRING_SIZE);
 422         g_string_append(context->string, "/* CTF 1.8 */\n\n");
 423         append_trace_metadata(writer, context);
 424         append_env_metadata(writer, context);
 425         g_ptr_array_foreach(writer->clocks,
 426                 (GFunc)bt_ctf_clock_serialize, context);
 427
 428         for (i = 0; i < writer->stream_classes->len; i++) {
 429                 err = bt_ctf_stream_class_serialize(
 430                         writer->stream_classes->pdata[i], context);
 431                 if (err) {
 432                         goto error;
 433                 }
 434         }
 435
 436         metadata = context->string->str;
 437 error:
 438         g_string_free(context->string, err ? TRUE : FALSE);
 439         g_string_free(context->field_name, TRUE);
 440         g_free(context);
 441 end:
 442         return metadata;
 443 }
 444
 445 void bt_ctf_writer_flush_metadata(struct bt_ctf_writer *writer)
 446 {
 447         int ret;
 448         char *metadata_string = NULL;
 449
 450         if (!writer) {
 451                 goto end;
 452         }
 453
 454         metadata_string = bt_ctf_writer_get_metadata_string(writer);
 455         if (!metadata_string) {
 456                 goto end;
 457         }
 458
 459         if (lseek(writer->metadata_fd, 0, SEEK_SET) == (off_t)-1) {
 460                 perror("lseek");
 461                 goto end;
 462         }
 463
 464         if (ftruncate(writer->metadata_fd, 0)) {
 465                 perror("ftruncate");
 466                 goto end;
 467         }
 468
 469         ret = write(writer->metadata_fd, metadata_string,
 470                 strlen(metadata_string));
 471         if (ret < 0) {
 472                 perror("write");
 473                 goto end;
 474         }
 475 end:
 476         g_free(metadata_string);
 477 }
 478
 479 int bt_ctf_writer_set_byte_order(struct bt_ctf_writer *writer,
 480                 enum bt_ctf_byte_order byte_order)
 481 {
 482         int ret = 0;
 483         int internal_byte_order;
 484
 485         if (!writer || writer->frozen) {
 486                 ret = -1;
 487                 goto end;
 488         }
 489
 490         switch (byte_order) {
 491         case BT_CTF_BYTE_ORDER_NATIVE:
 492                 internal_byte_order =  (G_BYTE_ORDER == G_LITTLE_ENDIAN) ?
 493                         LITTLE_ENDIAN : BIG_ENDIAN;
 494                 break;
 495         case BT_CTF_BYTE_ORDER_LITTLE_ENDIAN:
 496                 internal_byte_order = LITTLE_ENDIAN;
 497                 break;
 498         case BT_CTF_BYTE_ORDER_BIG_ENDIAN:
 499         case BT_CTF_BYTE_ORDER_NETWORK:
 500                 internal_byte_order = BIG_ENDIAN;
 501                 break;
 502         default:
 503                 ret = -1;
 504                 goto end;
 505         }
 506
 507         writer->byte_order = internal_byte_order;
 508         if (writer->trace_packet_header_type ||
 509                 writer->trace_packet_header) {
 510                 init_trace_packet_header(writer);
 511         }
 512 end:
 513         return ret;
 514 }
 515
 516 void bt_ctf_writer_get(struct bt_ctf_writer *writer)
 517 {
 518         if (!writer) {
 519                 return;
 520         }
 521
 522         bt_ctf_ref_get(&writer->ref_count);
 523 }
 524
 525 void bt_ctf_writer_put(struct bt_ctf_writer *writer)
 526 {
 527         if (!writer) {
 528                 return;
 529         }
 530
 531         bt_ctf_ref_put(&writer->ref_count, bt_ctf_writer_destroy);
 532 }
 533
 534 BT_HIDDEN
 535 int validate_identifier(const char *input_string)
 536 {
 537         int ret = 0;
 538         char *string = NULL;
 539         char *save_ptr, *token;
 540
 541         if (!input_string || input_string[0] == '\0') {
 542                 ret = -1;
 543                 goto end;
 544         }
 545
 546         string = strdup(input_string);
 547         if (!string) {
 548                 ret = -1;
 549                 goto end;
 550         }
 551
 552         token = strtok_r(string, " ", &save_ptr);
 553         while (token) {
 554                 if (g_hash_table_contains(reserved_keywords_set,
 555                         GINT_TO_POINTER(g_quark_from_string(token)))) {
 556                         ret = -1;
 557                         goto end;
 558                 }
 559
 560                 token = strtok_r(NULL, " ", &save_ptr);
 561         }
 562 end:
 563         free(string);
 564         return ret;
 565 }
 566
 567 BT_HIDDEN
 568 struct bt_ctf_field_type *get_field_type(enum field_type_alias alias)
 569 {
 570         unsigned int alignment, size;
 571         struct bt_ctf_field_type *field_type;
 572
 573         if (alias >= NR_FIELD_TYPE_ALIAS) {
 574                 return NULL;
 575         }
 576
 577         alignment = field_type_aliases_alignments[alias];
 578         size = field_type_aliases_sizes[alias];
 579         field_type = bt_ctf_field_type_integer_create(size);
 580         bt_ctf_field_type_set_alignment(field_type, alignment);
 581         return field_type;
 582 }
 583
 584 static
 585 int init_trace_packet_header(struct bt_ctf_writer *writer)
 586 {
 587         size_t i;
 588         int ret = 0;
 589         struct bt_ctf_field *trace_packet_header = NULL,
 590                 *magic = NULL, *uuid_array = NULL;
 591         struct bt_ctf_field_type *_uint32_t =
 592                 get_field_type(FIELD_TYPE_ALIAS_UINT32_T);
 593         struct bt_ctf_field_type *_uint8_t =
 594                 get_field_type(FIELD_TYPE_ALIAS_UINT8_T);
 595         struct bt_ctf_field_type *trace_packet_header_type =
 596                 bt_ctf_field_type_structure_create();
 597         struct bt_ctf_field_type *uuid_array_type =
 598                 bt_ctf_field_type_array_create(_uint8_t, 16);
 599
 600         if (!trace_packet_header_type || !uuid_array_type) {
 601                 ret = -1;
 602                 goto end;
 603         }
 604
 605         ret = bt_ctf_field_type_set_byte_order(_uint32_t,
 606                 (writer->byte_order == LITTLE_ENDIAN ?
 607                 BT_CTF_BYTE_ORDER_LITTLE_ENDIAN :
 608                 BT_CTF_BYTE_ORDER_BIG_ENDIAN));
 609         if (ret) {
 610                 goto end;
 611         }
 612
 613         ret = bt_ctf_field_type_structure_add_field(trace_packet_header_type,
 614                 _uint32_t, "magic");
 615         if (ret) {
 616                 goto end;
 617         }
 618
 619         ret = bt_ctf_field_type_structure_add_field(trace_packet_header_type,
 620                 uuid_array_type, "uuid");
 621         if (ret) {
 622                 goto end;
 623         }
 624
 625         ret = bt_ctf_field_type_structure_add_field(trace_packet_header_type,
 626                 _uint32_t, "stream_id");
 627         if (ret) {
 628                 goto end;
 629         }
 630
 631         trace_packet_header = bt_ctf_field_create(trace_packet_header_type);
 632         if (!trace_packet_header) {
 633                 ret = -1;
 634                 goto end;
 635         }
 636
 637         magic = bt_ctf_field_structure_get_field(trace_packet_header, "magic");
 638         ret = bt_ctf_field_unsigned_integer_set_value(magic, 0xC1FC1FC1);
 639         if (ret) {
 640                 goto end;
 641         }
 642
 643         uuid_array = bt_ctf_field_structure_get_field(trace_packet_header,
 644                 "uuid");
 645         for (i = 0; i < 16; i++) {
 646                 struct bt_ctf_field *uuid_element =
 647                         bt_ctf_field_array_get_field(uuid_array, i);
 648                 ret = bt_ctf_field_unsigned_integer_set_value(uuid_element,
 649                         writer->uuid[i]);
 650                 bt_ctf_field_put(uuid_element);
 651                 if (ret) {
 652                         goto end;
 653                 }
 654         }
 655
 656         bt_ctf_field_type_put(writer->trace_packet_header_type);
 657         bt_ctf_field_put(writer->trace_packet_header);
 658         writer->trace_packet_header_type = trace_packet_header_type;
 659         writer->trace_packet_header = trace_packet_header;
 660 end:
 661         bt_ctf_field_type_put(uuid_array_type);
 662         bt_ctf_field_type_put(_uint32_t);
 663         bt_ctf_field_type_put(_uint8_t);
 664         bt_ctf_field_put(magic);
 665         bt_ctf_field_put(uuid_array);
 666         if (ret) {
 667                 bt_ctf_field_type_put(trace_packet_header_type);
 668                 bt_ctf_field_put(trace_packet_header);
 669         }
 670
 671         return ret;
 672 }
 673
 674 static
 675 void environment_variable_destroy(struct environment_variable *var)
 676 {
 677         g_string_free(var->name, TRUE);
 678         g_string_free(var->value, TRUE);
 679         g_free(var);
 680 }
 681
 682 static
 683 int create_stream_file(struct bt_ctf_writer *writer,
 684                 struct bt_ctf_stream *stream)
 685 {
 686         int fd;
 687         GString *filename = g_string_new(stream->stream_class->name->str);
 688
 689         g_string_append_printf(filename, "_%" PRIu32, stream->id);
 690         fd = openat(writer->trace_dir_fd, filename->str,
 691                 O_RDWR | O_CREAT | O_TRUNC,
 692                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
 693         g_string_free(filename, TRUE);
 694         return fd;
 695 }
 696
 697 static
 698 void stream_flush_cb(struct bt_ctf_stream *stream, struct bt_ctf_writer *writer)
 699 {
 700         struct bt_ctf_field *stream_id;
 701
 702         /* Start a new packet in the stream */
 703         if (stream->flushed_packet_count) {
 704                 /* ctf_init_pos has already initialized the first packet */
 705                 ctf_packet_seek(&stream->pos.parent, 0, SEEK_CUR);
 706         }
 707
 708         stream_id = bt_ctf_field_structure_get_field(
 709                 writer->trace_packet_header, "stream_id");
 710         bt_ctf_field_unsigned_integer_set_value(stream_id, stream->id);
 711         bt_ctf_field_put(stream_id);
 712
 713         /* Write the trace_packet_header */
 714         bt_ctf_field_serialize(writer->trace_packet_header, &stream->pos);
 715 }
 716
 717 static __attribute__((constructor))
 718 void writer_init(void)
 719 {
 720         size_t i;
 721         const size_t reserved_keywords_count =
 722                 sizeof(reserved_keywords_str) / sizeof(char *);
 723
 724         global_data_refcount++;
 725         if (init_done) {
 726                 return;
 727         }
 728
 729         reserved_keywords_set = g_hash_table_new(g_direct_hash, g_direct_equal);
 730         for (i = 0; i < reserved_keywords_count; i++) {
 731                 g_hash_table_add(reserved_keywords_set,
 732                 GINT_TO_POINTER(g_quark_from_string(reserved_keywords_str[i])));
 733         }
 734
 735         init_done = 1;
 736 }
 737
 738 static __attribute__((destructor))
 739 void writer_finalize(void)
 740 {
 741         if (--global_data_refcount == 0) {
 742                 g_hash_table_destroy(reserved_keywords_set);
 743         }
 744 }