plugins/text/dmesg/dmesg.c

   1 /*
   2  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   3  * Copyright 2017 Philippe Proulx <jeremie.galarneau@efficios.com>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #define BT_LOG_TAG "PLUGIN-TEXT-DMESG-SRC"
  25 #include "logging.h"
  26
  27 #include <stdbool.h>
  28 #include <string.h>
  29 #include <ctype.h>
  30 #include <stdio.h>
  31 #include <babeltrace/assert-internal.h>
  32 #include <babeltrace/babeltrace.h>
  33 #include <babeltrace/values-internal.h>
  34 #include <babeltrace/compat/utc-internal.h>
  35 #include <babeltrace/compat/stdio-internal.h>
  36 #include <glib.h>
  37
  38 #define NSEC_PER_USEC 1000UL
  39 #define NSEC_PER_MSEC 1000000UL
  40 #define NSEC_PER_SEC 1000000000ULL
  41 #define USEC_PER_SEC 1000000UL
  42
  43 struct dmesg_component;
  44
  45 struct dmesg_notif_iter {
  46         struct dmesg_component *dmesg_comp;
  47         char *linebuf;
  48         size_t linebuf_len;
  49         FILE *fp;
  50 };
  51
  52 struct dmesg_component {
  53         struct {
  54                 GString *path;
  55                 bt_bool read_from_stdin;
  56                 bt_bool no_timestamp;
  57         } params;
  58
  59         struct bt_trace *trace;
  60         struct bt_stream_class *stream_class;
  61         struct bt_event_class *event_class;
  62         struct bt_stream *stream;
  63         struct bt_packet *packet;
  64         struct bt_clock_class *clock_class;
  65         struct bt_clock_class_priority_map *cc_prio_map;
  66 };
  67
  68 static
  69 struct bt_field_type *create_packet_header_ft(void)
  70 {
  71         struct bt_field_type *root_ft = NULL;
  72         struct bt_field_type *ft = NULL;
  73         int ret;
  74
  75         root_ft = bt_field_type_structure_create();
  76         if (!root_ft) {
  77                 BT_LOGE_STR("Cannot create an empty structure field type object.");
  78                 goto error;
  79         }
  80
  81         ft = bt_field_type_integer_create(32);
  82         if (!ft) {
  83                 BT_LOGE_STR("Cannot create an integer field type object.");
  84                 goto error;
  85         }
  86
  87         ret = bt_field_type_structure_add_field(root_ft, ft, "magic");
  88         if (ret) {
  89                 BT_LOGE("Cannot add `magic` field type to structure field type: "
  90                         "ret=%d", ret);
  91                 goto error;
  92         }
  93
  94         BT_PUT(ft);
  95         ft = bt_field_type_integer_create(8);
  96         if (!ft) {
  97                 BT_LOGE_STR("Cannot create an integer field type object.");
  98                 goto error;
  99         }
 100
 101         goto end;
 102
 103 error:
 104         BT_PUT(root_ft);
 105
 106 end:
 107         bt_put(ft);
 108         return root_ft;
 109 }
 110
 111 static
 112 struct bt_field_type *create_packet_context_ft(void)
 113 {
 114         struct bt_field_type *root_ft = NULL;
 115         struct bt_field_type *ft = NULL;
 116         int ret;
 117
 118         root_ft = bt_field_type_structure_create();
 119         if (!root_ft) {
 120                 BT_LOGE_STR("Cannot create an empty structure field type object.");
 121                 goto error;
 122         }
 123
 124         ft = bt_field_type_integer_create(64);
 125         if (!ft) {
 126                 BT_LOGE_STR("Cannot create an integer field type object.");
 127                 goto error;
 128         }
 129
 130         ret = bt_field_type_structure_add_field(root_ft,
 131                 ft, "content_size");
 132         if (ret) {
 133                 BT_LOGE("Cannot add `content_size` field type to structure field type: "
 134                         "ret=%d", ret);
 135                 goto error;
 136         }
 137
 138         BT_PUT(ft);
 139         ft = bt_field_type_integer_create(64);
 140         if (!ft) {
 141                 BT_LOGE_STR("Cannot create an integer field type object.");
 142                 goto error;
 143         }
 144
 145         ret = bt_field_type_structure_add_field(root_ft,
 146                 ft, "packet_size");
 147         if (ret) {
 148                 BT_LOGE("Cannot add `packet_size` field type to structure field type: "
 149                         "ret=%d", ret);
 150                 goto error;
 151         }
 152
 153         goto end;
 154
 155 error:
 156         BT_PUT(root_ft);
 157
 158 end:
 159         bt_put(ft);
 160         return root_ft;
 161 }
 162
 163 static
 164 struct bt_field_type *create_event_header_ft(
 165                 struct bt_clock_class *clock_class)
 166 {
 167         struct bt_field_type *root_ft = NULL;
 168         struct bt_field_type *ft = NULL;
 169         int ret;
 170
 171         root_ft = bt_field_type_structure_create();
 172         if (!root_ft) {
 173                 BT_LOGE_STR("Cannot create an empty structure field type object.");
 174                 goto error;
 175         }
 176
 177         ft = bt_field_type_integer_create(64);
 178         if (!ft) {
 179                 BT_LOGE_STR("Cannot create an integer field type object.");
 180                 goto error;
 181         }
 182
 183         ret = bt_field_type_integer_set_mapped_clock_class(ft, clock_class);
 184         if (ret) {
 185                 BT_LOGE("Cannot map integer field type to clock class: "
 186                         "ret=%d", ret);
 187                 goto error;
 188         }
 189
 190         ret = bt_field_type_structure_add_field(root_ft,
 191                 ft, "timestamp");
 192         if (ret) {
 193                 BT_LOGE("Cannot add `timestamp` field type to structure field type: "
 194                         "ret=%d", ret);
 195                 goto error;
 196         }
 197
 198         goto end;
 199
 200 error:
 201         BT_PUT(root_ft);
 202
 203 end:
 204         bt_put(ft);
 205         return root_ft;
 206 }
 207
 208 static
 209 struct bt_field_type *create_event_payload_ft(void)
 210 {
 211         struct bt_field_type *root_ft = NULL;
 212         struct bt_field_type *ft = NULL;
 213         int ret;
 214
 215         root_ft = bt_field_type_structure_create();
 216         if (!root_ft) {
 217                 BT_LOGE_STR("Cannot create an empty structure field type object.");
 218                 goto error;
 219         }
 220
 221         ft = bt_field_type_string_create();
 222         if (!ft) {
 223                 BT_LOGE_STR("Cannot create a string field type object.");
 224                 goto error;
 225         }
 226
 227         ret = bt_field_type_structure_add_field(root_ft,
 228                 ft, "str");
 229         if (ret) {
 230                 BT_LOGE("Cannot add `str` field type to structure field type: "
 231                         "ret=%d", ret);
 232                 goto error;
 233         }
 234
 235         goto end;
 236
 237 error:
 238         BT_PUT(root_ft);
 239
 240 end:
 241         bt_put(ft);
 242         return root_ft;
 243 }
 244
 245 static
 246 struct bt_clock_class *create_clock_class(void)
 247 {
 248         return bt_clock_class_create("the_clock", 1000000000);
 249 }
 250
 251 static
 252 int create_meta(struct dmesg_component *dmesg_comp, bool has_ts)
 253 {
 254         struct bt_field_type *ft = NULL;
 255         const char *trace_name = NULL;
 256         gchar *basename = NULL;
 257         int ret = 0;
 258
 259         dmesg_comp->trace = bt_trace_create();
 260         if (!dmesg_comp->trace) {
 261                 BT_LOGE_STR("Cannot create an empty trace object.");
 262                 goto error;
 263         }
 264
 265         ft = create_packet_header_ft();
 266         if (!ft) {
 267                 BT_LOGE_STR("Cannot create packet header field type.");
 268                 goto error;
 269         }
 270
 271         ret = bt_trace_set_packet_header_type(dmesg_comp->trace, ft);
 272         if (ret) {
 273                 BT_LOGE_STR("Cannot set trace's packet header field type.");
 274                 goto error;
 275         }
 276
 277         if (dmesg_comp->params.read_from_stdin) {
 278                 trace_name = "STDIN";
 279         } else {
 280                 basename = g_path_get_basename(dmesg_comp->params.path->str);
 281                 BT_ASSERT(basename);
 282
 283                 if (strcmp(basename, G_DIR_SEPARATOR_S) != 0 &&
 284                                 strcmp(basename, ".") != 0) {
 285                         trace_name = basename;
 286                 }
 287         }
 288
 289         if (trace_name) {
 290                 ret = bt_trace_set_name(dmesg_comp->trace, trace_name);
 291                 if (ret) {
 292                         BT_LOGE("Cannot set trace's name: name=\"%s\"", trace_name);
 293                         goto error;
 294                 }
 295         }
 296
 297         dmesg_comp->stream_class = bt_stream_class_create_empty(NULL);
 298         if (!dmesg_comp->stream_class) {
 299                 BT_LOGE_STR("Cannot create an empty stream class object.");
 300                 goto error;
 301         }
 302
 303         bt_put(ft);
 304         ft = create_packet_context_ft();
 305         if (!ft) {
 306                 BT_LOGE_STR("Cannot create packet context field type.");
 307                 goto error;
 308         }
 309
 310         ret = bt_stream_class_set_packet_context_type(
 311                 dmesg_comp->stream_class, ft);
 312         if (ret) {
 313                 BT_LOGE_STR("Cannot set stream class's packet context field type.");
 314                 goto error;
 315         }
 316
 317         dmesg_comp->cc_prio_map = bt_clock_class_priority_map_create();
 318         if (!dmesg_comp->cc_prio_map) {
 319                 BT_LOGE_STR("Cannot create empty clock class priority map.");
 320                 goto error;
 321         }
 322
 323         if (has_ts) {
 324                 dmesg_comp->clock_class = create_clock_class();
 325                 if (!dmesg_comp->clock_class) {
 326                         BT_LOGE_STR("Cannot create clock class.");
 327                         goto error;
 328                 }
 329
 330                 ret = bt_trace_add_clock_class(dmesg_comp->trace,
 331                         dmesg_comp->clock_class);
 332                 if (ret) {
 333                         BT_LOGE_STR("Cannot add clock class to trace.");
 334                         goto error;
 335                 }
 336
 337                 ret = bt_clock_class_priority_map_add_clock_class(
 338                         dmesg_comp->cc_prio_map, dmesg_comp->clock_class, 0);
 339                 if (ret) {
 340                         BT_LOGE_STR("Cannot add clock class to clock class priority map.");
 341                         goto error;
 342                 }
 343
 344                 bt_put(ft);
 345                 ft = create_event_header_ft(dmesg_comp->clock_class);
 346                 if (!ft) {
 347                         BT_LOGE_STR("Cannot create event header field type.");
 348                         goto error;
 349                 }
 350
 351                 ret = bt_stream_class_set_event_header_type(
 352                         dmesg_comp->stream_class, ft);
 353                 if (ret) {
 354                         BT_LOGE_STR("Cannot set stream class's event header field type.");
 355                         goto error;
 356                 }
 357         }
 358
 359         dmesg_comp->event_class = bt_event_class_create("string");
 360         if (!dmesg_comp->event_class) {
 361                 BT_LOGE_STR("Cannot create an empty event class object.");
 362                 goto error;
 363         }
 364
 365         bt_put(ft);
 366         ft = create_event_payload_ft();
 367         if (!ft) {
 368                 BT_LOGE_STR("Cannot create event payload field type.");
 369                 goto error;
 370         }
 371
 372         ret = bt_event_class_set_payload_type(dmesg_comp->event_class, ft);
 373         if (ret) {
 374                 BT_LOGE_STR("Cannot set event class's event payload field type.");
 375                 goto error;
 376         }
 377
 378         ret = bt_stream_class_add_event_class(dmesg_comp->stream_class,
 379                 dmesg_comp->event_class);
 380         if (ret) {
 381                 BT_LOGE("Cannot add event class to stream class: ret=%d", ret);
 382                 goto error;
 383         }
 384
 385         ret = bt_trace_add_stream_class(dmesg_comp->trace,
 386                 dmesg_comp->stream_class);
 387         if (ret) {
 388                 BT_LOGE("Cannot add event class to stream class: ret=%d", ret);
 389                 goto error;
 390         }
 391
 392         goto end;
 393
 394 error:
 395         ret = -1;
 396
 397 end:
 398         bt_put(ft);
 399
 400         if (basename) {
 401                 g_free(basename);
 402         }
 403
 404         return ret;
 405 }
 406
 407 static
 408 int handle_params(struct dmesg_component *dmesg_comp, struct bt_value *params)
 409 {
 410         struct bt_value *read_from_stdin = NULL;
 411         struct bt_value *no_timestamp = NULL;
 412         struct bt_value *path = NULL;
 413         const char *path_str;
 414         int ret = 0;
 415
 416         no_timestamp = bt_value_map_get(params, "no-extract-timestamp");
 417         if (no_timestamp) {
 418                 if (!bt_value_is_bool(no_timestamp)) {
 419                         BT_LOGE("Expecting a boolean value for the `no-extract-timestamp` parameter: "
 420                                 "type=%s",
 421                                 bt_value_type_string(
 422                                         bt_value_get_type(no_timestamp)));
 423                         goto error;
 424                 }
 425
 426                 ret = bt_value_bool_get(no_timestamp,
 427                         &dmesg_comp->params.no_timestamp);
 428                 BT_ASSERT(ret == 0);
 429         }
 430
 431         path = bt_value_map_get(params, "path");
 432         if (path) {
 433                 if (dmesg_comp->params.read_from_stdin) {
 434                         BT_LOGE_STR("Cannot specify both `read-from-stdin` and `path` parameters.");
 435                         goto error;
 436                 }
 437
 438                 if (!bt_value_is_string(path)) {
 439                         BT_LOGE("Expecting a string value for the `path` parameter: "
 440                                 "type=%s",
 441                                 bt_value_type_string(
 442                                         bt_value_get_type(path)));
 443                         goto error;
 444                 }
 445
 446                 ret = bt_value_string_get(path, &path_str);
 447                 BT_ASSERT(ret == 0);
 448                 g_string_assign(dmesg_comp->params.path, path_str);
 449         } else {
 450                 dmesg_comp->params.read_from_stdin = true;
 451         }
 452
 453         goto end;
 454
 455 error:
 456         ret = -1;
 457
 458 end:
 459         bt_put(read_from_stdin);
 460         bt_put(path);
 461         bt_put(no_timestamp);
 462         return ret;
 463 }
 464
 465 static
 466 struct bt_field *create_packet_header_field(struct bt_field_type *ft)
 467 {
 468         struct bt_field *ph = NULL;
 469         struct bt_field *magic = NULL;
 470         int ret;
 471
 472         ph = bt_field_create(ft);
 473         if (!ph) {
 474                 BT_LOGE_STR("Cannot create field object.");
 475                 goto error;
 476         }
 477
 478         magic = bt_field_structure_get_field_by_name(ph, "magic");
 479         if (!magic) {
 480                 BT_LOGE_STR("Cannot get `magic` field from structure field.");
 481                 goto error;
 482         }
 483
 484         ret = bt_field_unsigned_integer_set_value(magic, 0xc1fc1fc1);
 485         if (ret) {
 486                 BT_LOGE_STR("Cannot set integer field's value.");
 487                 goto error;
 488         }
 489
 490         goto end;
 491
 492 error:
 493         BT_PUT(ph);
 494
 495 end:
 496         bt_put(magic);
 497         return ph;
 498 }
 499
 500 static
 501 struct bt_field *create_packet_context_field(struct bt_field_type *ft)
 502 {
 503         struct bt_field *pc = NULL;
 504         struct bt_field *field = NULL;
 505         int ret;
 506
 507         pc = bt_field_create(ft);
 508         if (!pc) {
 509                 BT_LOGE_STR("Cannot create field object.");
 510                 goto error;
 511         }
 512
 513         field = bt_field_structure_get_field_by_name(pc, "content_size");
 514         if (!field) {
 515                 BT_LOGE_STR("Cannot get `content_size` field from structure field.");
 516                 goto error;
 517         }
 518
 519         ret = bt_field_unsigned_integer_set_value(field, 0);
 520         if (ret) {
 521                 BT_LOGE_STR("Cannot set integer field's value.");
 522                 goto error;
 523         }
 524
 525         bt_put(field);
 526         field = bt_field_structure_get_field_by_name(pc, "packet_size");
 527         if (!field) {
 528                 BT_LOGE_STR("Cannot get `packet_size` field from structure field.");
 529                 goto error;
 530         }
 531
 532         ret = bt_field_unsigned_integer_set_value(field, 0);
 533         if (ret) {
 534                 BT_LOGE_STR("Cannot set integer field's value.");
 535                 goto error;
 536         }
 537
 538         goto end;
 539
 540 error:
 541         BT_PUT(pc);
 542
 543 end:
 544         bt_put(field);
 545         return pc;
 546 }
 547
 548 static
 549 int create_packet_and_stream(struct dmesg_component *dmesg_comp)
 550 {
 551         int ret = 0;
 552         struct bt_field_type *ft = NULL;
 553         struct bt_field *field = NULL;
 554
 555         dmesg_comp->stream = bt_stream_create(dmesg_comp->stream_class,
 556                 NULL);
 557         if (!dmesg_comp->stream) {
 558                 BT_LOGE_STR("Cannot create stream object.");
 559                 goto error;
 560         }
 561
 562         dmesg_comp->packet = bt_packet_create(dmesg_comp->stream);
 563         if (!dmesg_comp->packet) {
 564                 BT_LOGE_STR("Cannot create packet object.");
 565                 goto error;
 566         }
 567
 568         ft = bt_trace_get_packet_header_type(dmesg_comp->trace);
 569         BT_ASSERT(ft);
 570         field = create_packet_header_field(ft);
 571         if (!field) {
 572                 BT_LOGE_STR("Cannot create packet header field.");
 573                 goto error;
 574         }
 575
 576         ret = bt_packet_set_header(dmesg_comp->packet, field);
 577         if (ret) {
 578                 BT_LOGE_STR("Cannot set packet's header field.");
 579                 goto error;
 580         }
 581
 582         bt_put(ft);
 583         bt_put(field);
 584         ft = bt_stream_class_get_packet_context_type(
 585                 dmesg_comp->stream_class);
 586         BT_ASSERT(ft);
 587         field = create_packet_context_field(ft);
 588         if (!field) {
 589                 BT_LOGE_STR("Cannot create packet context field.");
 590                 goto error;
 591         }
 592
 593         ret = bt_packet_set_context(dmesg_comp->packet, field);
 594         if (ret) {
 595                 BT_LOGE_STR("Cannot set packet's context field.");
 596                 goto error;
 597         }
 598
 599         ret = bt_trace_set_is_static(dmesg_comp->trace);
 600         if (ret) {
 601                 BT_LOGE_STR("Cannot make trace static.");
 602                 goto error;
 603         }
 604
 605         goto end;
 606
 607 error:
 608         ret = -1;
 609
 610 end:
 611         bt_put(field);
 612         bt_put(ft);
 613         return ret;
 614 }
 615
 616 static
 617 int try_create_meta_stream_packet(struct dmesg_component *dmesg_comp,
 618                 bool has_ts)
 619 {
 620         int ret = 0;
 621
 622         if (dmesg_comp->trace) {
 623                 /* Already created */
 624                 goto end;
 625         }
 626
 627         ret = create_meta(dmesg_comp, has_ts);
 628         if (ret) {
 629                 BT_LOGE("Cannot create metadata objects: dmesg-comp-addr=%p",
 630                         dmesg_comp);
 631                 goto error;
 632         }
 633
 634         ret = create_packet_and_stream(dmesg_comp);
 635         if (ret) {
 636                 BT_LOGE("Cannot create packet and stream objects: "
 637                         "dmesg-comp-addr=%p", dmesg_comp);
 638                 goto error;
 639         }
 640
 641         goto end;
 642
 643 error:
 644         ret = -1;
 645
 646 end:
 647         return ret;
 648 }
 649
 650 static
 651 void destroy_dmesg_component(struct dmesg_component *dmesg_comp)
 652 {
 653         if (!dmesg_comp) {
 654                 return;
 655         }
 656
 657         if (dmesg_comp->params.path) {
 658                 g_string_free(dmesg_comp->params.path, TRUE);
 659         }
 660
 661         bt_put(dmesg_comp->packet);
 662         bt_put(dmesg_comp->trace);
 663         bt_put(dmesg_comp->stream_class);
 664         bt_put(dmesg_comp->event_class);
 665         bt_put(dmesg_comp->stream);
 666         bt_put(dmesg_comp->clock_class);
 667         bt_put(dmesg_comp->cc_prio_map);
 668         g_free(dmesg_comp);
 669 }
 670
 671 static
 672 enum bt_component_status create_port(struct bt_private_component *priv_comp)
 673 {
 674         return bt_private_component_source_add_output_private_port(priv_comp,
 675                 "out", NULL, NULL);
 676 }
 677
 678 BT_HIDDEN
 679 enum bt_component_status dmesg_init(struct bt_private_component *priv_comp,
 680                 struct bt_value *params, void *init_method_data)
 681 {
 682         int ret = 0;
 683         struct dmesg_component *dmesg_comp = g_new0(struct dmesg_component, 1);
 684         enum bt_component_status status = BT_COMPONENT_STATUS_OK;
 685
 686         if (!dmesg_comp) {
 687                 BT_LOGE_STR("Failed to allocate one dmesg component structure.");
 688                 goto error;
 689         }
 690
 691         dmesg_comp->params.path = g_string_new(NULL);
 692         if (!dmesg_comp->params.path) {
 693                 BT_LOGE_STR("Failed to allocate a GString.");
 694                 goto error;
 695         }
 696
 697         ret = handle_params(dmesg_comp, params);
 698         if (ret) {
 699                 BT_LOGE("Invalid parameters: comp-addr=%p", priv_comp);
 700                 goto error;
 701         }
 702
 703         if (!dmesg_comp->params.read_from_stdin &&
 704                         !g_file_test(dmesg_comp->params.path->str,
 705                         G_FILE_TEST_IS_REGULAR)) {
 706                 BT_LOGE("Input path is not a regular file: "
 707                         "comp-addr=%p, path=\"%s\"", priv_comp,
 708                         dmesg_comp->params.path->str);
 709                 goto error;
 710         }
 711
 712         status = create_port(priv_comp);
 713         if (status != BT_COMPONENT_STATUS_OK) {
 714                 goto error;
 715         }
 716
 717         (void) bt_private_component_set_user_data(priv_comp, dmesg_comp);
 718         goto end;
 719
 720 error:
 721         destroy_dmesg_component(dmesg_comp);
 722         (void) bt_private_component_set_user_data(priv_comp, NULL);
 723
 724         if (status >= 0) {
 725                 status = BT_COMPONENT_STATUS_ERROR;
 726         }
 727
 728 end:
 729         return status;
 730 }
 731
 732 BT_HIDDEN
 733 void dmesg_finalize(struct bt_private_component *priv_comp)
 734 {
 735         void *data = bt_private_component_get_user_data(priv_comp);
 736
 737         destroy_dmesg_component(data);
 738 }
 739
 740 static
 741 int create_event_header_from_line(
 742                 struct dmesg_component *dmesg_comp,
 743                 const char *line, const char **new_start,
 744                 struct bt_field **user_field,
 745                 struct bt_clock_value **user_clock_value)
 746 {
 747         bool has_timestamp = false;
 748         unsigned long sec, usec, msec;
 749         unsigned int year, mon, mday, hour, min;
 750         uint64_t ts = 0;
 751         struct bt_clock_value *clock_value = NULL;
 752         struct bt_field_type *ft = NULL;
 753         struct bt_field *eh_field = NULL;
 754         struct bt_field *ts_field = NULL;
 755         int ret = 0;
 756
 757         BT_ASSERT(user_clock_value);
 758         BT_ASSERT(user_field);
 759         *new_start = line;
 760
 761         if (dmesg_comp->params.no_timestamp) {
 762                 goto skip_ts;
 763         }
 764
 765         /* Extract time from input line */
 766         if (sscanf(line, "[%lu.%lu] ", &sec, &usec) == 2) {
 767                 ts = (uint64_t) sec * USEC_PER_SEC + (uint64_t) usec;
 768
 769                 /*
 770                  * The clock class we use has a 1 GHz frequency: convert
 771                  * from µs to ns.
 772                  */
 773                 ts *= NSEC_PER_USEC;
 774                 has_timestamp = true;
 775         } else if (sscanf(line, "[%u-%u-%u %u:%u:%lu.%lu] ",
 776                         &year, &mon, &mday, &hour, &min,
 777                         &sec, &msec) == 7) {
 778                 time_t ep_sec;
 779                 struct tm ti;
 780
 781                 memset(&ti, 0, sizeof(ti));
 782                 ti.tm_year = year - 1900;       /* From 1900 */
 783                 ti.tm_mon = mon - 1;            /* 0 to 11 */
 784                 ti.tm_mday = mday;
 785                 ti.tm_hour = hour;
 786                 ti.tm_min = min;
 787                 ti.tm_sec = sec;
 788
 789                 ep_sec = bt_timegm(&ti);
 790                 if (ep_sec != (time_t) -1) {
 791                         ts = (uint64_t) ep_sec * NSEC_PER_SEC
 792                                 + (uint64_t) msec * NSEC_PER_MSEC;
 793                 }
 794
 795                 has_timestamp = true;
 796         }
 797
 798         if (has_timestamp) {
 799                 /* Set new start for the message portion of the line */
 800                 *new_start = strchr(line, ']');
 801                 BT_ASSERT(*new_start);
 802                 (*new_start)++;
 803
 804                 if ((*new_start)[0] == ' ') {
 805                         (*new_start)++;
 806                 }
 807         }
 808
 809 skip_ts:
 810         /*
 811          * At this point, we know if the stream class's event header
 812          * field type should have a timestamp or not, so we can lazily
 813          * create the metadata, stream, and packet objects.
 814          */
 815         ret = try_create_meta_stream_packet(dmesg_comp, has_timestamp);
 816         if (ret) {
 817                 /* try_create_meta_stream_packet() logs errors */
 818                 goto error;
 819         }
 820
 821         if (dmesg_comp->clock_class) {
 822                 clock_value = bt_clock_value_create(dmesg_comp->clock_class,
 823                         ts);
 824                 if (!clock_value) {
 825                         BT_LOGE_STR("Cannot create clock value object.");
 826                         goto error;
 827                 }
 828
 829                 ft = bt_stream_class_get_event_header_type(
 830                         dmesg_comp->stream_class);
 831                 BT_ASSERT(ft);
 832                 eh_field = bt_field_create(ft);
 833                 if (!eh_field) {
 834                         BT_LOGE_STR("Cannot create event header field object.");
 835                         goto error;
 836                 }
 837
 838                 ts_field = bt_field_structure_get_field_by_name(eh_field,
 839                         "timestamp");
 840                 if (!ts_field) {
 841                         BT_LOGE_STR("Cannot get `timestamp` field from structure field.");
 842                         goto error;
 843                 }
 844
 845                 ret = bt_field_unsigned_integer_set_value(ts_field, ts);
 846                 if (ret) {
 847                         BT_LOGE_STR("Cannot set integer field's value.");
 848                         goto error;
 849                 }
 850
 851                 *user_clock_value = clock_value;
 852                 clock_value = NULL;
 853                 *user_field = eh_field;
 854                 eh_field = NULL;
 855         }
 856
 857         goto end;
 858
 859 error:
 860         ret = -1;
 861
 862 end:
 863         bt_put(ft);
 864         bt_put(ts_field);
 865         bt_put(clock_value);
 866         bt_put(eh_field);
 867         return ret;
 868 }
 869
 870 static
 871 int create_event_payload_from_line(
 872                 struct dmesg_component *dmesg_comp,
 873                 const char *line, struct bt_field **user_field)
 874 {
 875         struct bt_field_type *ft = NULL;
 876         struct bt_field *ep_field = NULL;
 877         struct bt_field *str_field = NULL;
 878         size_t len;
 879         int ret;
 880
 881         BT_ASSERT(user_field);
 882         ft = bt_event_class_get_payload_type(dmesg_comp->event_class);
 883         BT_ASSERT(ft);
 884         ep_field = bt_field_create(ft);
 885         if (!ep_field) {
 886                 BT_LOGE_STR("Cannot create event payload field object.");
 887                 goto error;
 888         }
 889
 890         str_field = bt_field_structure_get_field_by_name(ep_field, "str");
 891         if (!str_field) {
 892                 BT_LOGE_STR("Cannot get `timestamp` field from structure field.");
 893                 goto error;
 894         }
 895
 896         len = strlen(line);
 897         if (line[len - 1] == '\n') {
 898                 /* Do not include the newline character in the payload */
 899                 len--;
 900         }
 901
 902         ret = bt_field_string_append_len(str_field, line, len);
 903         if (ret) {
 904                 BT_LOGE("Cannot append value to string field object: "
 905                         "len=%zu", len);
 906                 goto error;
 907         }
 908
 909         *user_field = ep_field;
 910         ep_field = NULL;
 911         goto end;
 912
 913 error:
 914         ret = -1;
 915
 916 end:
 917         bt_put(ft);
 918         bt_put(ep_field);
 919         bt_put(str_field);
 920         return ret;
 921 }
 922
 923 static
 924 struct bt_notification *create_notif_from_line(
 925                 struct dmesg_component *dmesg_comp, const char *line)
 926 {
 927         struct bt_field *eh_field = NULL;
 928         struct bt_field *ep_field = NULL;
 929         struct bt_clock_value *clock_value = NULL;
 930         struct bt_event *event = NULL;
 931         struct bt_notification *notif = NULL;
 932         const char *new_start;
 933         int ret;
 934
 935         ret = create_event_header_from_line(dmesg_comp, line, &new_start,
 936                 &eh_field, &clock_value);
 937         if (ret) {
 938                 BT_LOGE("Cannot create event header field from line: "
 939                         "ret=%d", ret);
 940                 goto error;
 941         }
 942
 943         ret = create_event_payload_from_line(dmesg_comp, new_start,
 944                 &ep_field);
 945         if (ret) {
 946                 BT_LOGE("Cannot create event payload field from line: "
 947                         "ret=%d", ret);
 948                 goto error;
 949         }
 950
 951         BT_ASSERT(ep_field);
 952         event = bt_event_create(dmesg_comp->event_class);
 953         if (!event) {
 954                 BT_LOGE_STR("Cannot create event object.");
 955                 goto error;
 956         }
 957
 958         ret = bt_event_set_packet(event, dmesg_comp->packet);
 959         if (ret) {
 960                 BT_LOGE_STR("Cannot set event's packet.");
 961                 goto error;
 962         }
 963
 964         if (eh_field) {
 965                 ret = bt_event_set_header(event, eh_field);
 966                 if (ret) {
 967                         BT_LOGE_STR("Cannot set event's header field.");
 968                         goto error;
 969                 }
 970         }
 971
 972         ret = bt_event_set_event_payload(event, ep_field);
 973         if (ret) {
 974                 BT_LOGE_STR("Cannot set event's payload field.");
 975                 goto error;
 976         }
 977
 978         if (clock_value) {
 979                 ret = bt_event_set_clock_value(event, clock_value);
 980                 if (ret) {
 981                         BT_LOGE_STR("Cannot set event's clock value.");
 982                         goto error;
 983                 }
 984         }
 985
 986         notif = bt_notification_event_create(event, dmesg_comp->cc_prio_map);
 987         if (!notif) {
 988                 BT_LOGE_STR("Cannot create event notification.");
 989                 goto error;
 990         }
 991
 992         goto end;
 993
 994 error:
 995         BT_PUT(notif);
 996
 997 end:
 998         bt_put(eh_field);
 999         bt_put(ep_field);
1000         bt_put(clock_value);
1001         bt_put(event);
1002         return notif;
1003 }
1004
1005 static
1006 void destroy_dmesg_notif_iter(struct dmesg_notif_iter *dmesg_notif_iter)
1007 {
1008         if (!dmesg_notif_iter) {
1009                 return;
1010         }
1011
1012         if (dmesg_notif_iter->fp && dmesg_notif_iter->fp != stdin) {
1013                 if (fclose(dmesg_notif_iter->fp)) {
1014                         BT_LOGE_ERRNO("Cannot close input file", ".");
1015                 }
1016         }
1017
1018         free(dmesg_notif_iter->linebuf);
1019         g_free(dmesg_notif_iter);
1020 }
1021
1022 BT_HIDDEN
1023 enum bt_notification_iterator_status dmesg_notif_iter_init(
1024                 struct bt_private_connection_private_notification_iterator *priv_notif_iter,
1025                 struct bt_private_port *priv_port)
1026 {
1027         struct bt_private_component *priv_comp = NULL;
1028         struct dmesg_component *dmesg_comp;
1029         struct dmesg_notif_iter *dmesg_notif_iter =
1030                 g_new0(struct dmesg_notif_iter, 1);
1031         enum bt_notification_iterator_status status =
1032                 BT_NOTIFICATION_ITERATOR_STATUS_OK;
1033
1034         if (!dmesg_notif_iter) {
1035                 BT_LOGE_STR("Failed to allocate on dmesg notification iterator structure.");
1036                 goto error;
1037         }
1038
1039         priv_comp = bt_private_connection_private_notification_iterator_get_private_component(
1040                 priv_notif_iter);
1041         BT_ASSERT(priv_comp);
1042         dmesg_comp = bt_private_component_get_user_data(priv_comp);
1043         BT_ASSERT(dmesg_comp);
1044         dmesg_notif_iter->dmesg_comp = dmesg_comp;
1045
1046         if (dmesg_comp->params.read_from_stdin) {
1047                 dmesg_notif_iter->fp = stdin;
1048         } else {
1049                 dmesg_notif_iter->fp = fopen(dmesg_comp->params.path->str, "r");
1050                 if (!dmesg_notif_iter->fp) {
1051                         BT_LOGE_ERRNO("Cannot open input file in read mode", ": path=\"%s\"",
1052                                 dmesg_comp->params.path->str);
1053                         goto error;
1054                 }
1055         }
1056
1057         (void) bt_private_connection_private_notification_iterator_set_user_data(priv_notif_iter,
1058                 dmesg_notif_iter);
1059         goto end;
1060
1061 error:
1062         destroy_dmesg_notif_iter(dmesg_notif_iter);
1063         (void) bt_private_connection_private_notification_iterator_set_user_data(priv_notif_iter,
1064                 NULL);
1065         if (status >= 0) {
1066                 status = BT_NOTIFICATION_ITERATOR_STATUS_ERROR;
1067         }
1068
1069 end:
1070         bt_put(priv_comp);
1071         return status;
1072 }
1073
1074 BT_HIDDEN
1075 void dmesg_notif_iter_finalize(
1076                 struct bt_private_connection_private_notification_iterator *priv_notif_iter)
1077 {
1078         destroy_dmesg_notif_iter(bt_private_connection_private_notification_iterator_get_user_data(
1079                 priv_notif_iter));
1080 }
1081
1082 BT_HIDDEN
1083 struct bt_notification_iterator_next_method_return dmesg_notif_iter_next(
1084                 struct bt_private_connection_private_notification_iterator *priv_notif_iter)
1085 {
1086         ssize_t len;
1087         struct dmesg_notif_iter *dmesg_notif_iter =
1088                 bt_private_connection_private_notification_iterator_get_user_data(
1089                         priv_notif_iter);
1090         struct dmesg_component *dmesg_comp;
1091         struct bt_notification_iterator_next_method_return next_ret = {
1092                 .status = BT_NOTIFICATION_ITERATOR_STATUS_OK,
1093                 .notification = NULL
1094         };
1095
1096         BT_ASSERT(dmesg_notif_iter);
1097         dmesg_comp = dmesg_notif_iter->dmesg_comp;
1098         BT_ASSERT(dmesg_comp);
1099
1100         while (true) {
1101                 const char *ch;
1102                 bool only_spaces = true;
1103
1104                 len = bt_getline(&dmesg_notif_iter->linebuf,
1105                         &dmesg_notif_iter->linebuf_len, dmesg_notif_iter->fp);
1106                 if (len < 0) {
1107                         if (errno == EINVAL) {
1108                                 next_ret.status =
1109                                         BT_NOTIFICATION_ITERATOR_STATUS_ERROR;
1110                         } else if (errno == ENOMEM) {
1111                                 next_ret.status =
1112                                         BT_NOTIFICATION_ITERATOR_STATUS_NOMEM;
1113                         } else {
1114                                 next_ret.status =
1115                                         BT_NOTIFICATION_ITERATOR_STATUS_END;
1116                         }
1117
1118                         goto end;
1119                 }
1120
1121                 BT_ASSERT(dmesg_notif_iter->linebuf);
1122
1123                 /* Ignore empty lines, once trimmed */
1124                 for (ch = dmesg_notif_iter->linebuf; *ch != '\0'; ch++) {
1125                         if (!isspace(*ch)) {
1126                                 only_spaces = false;
1127                                 break;
1128                         }
1129                 }
1130
1131                 if (!only_spaces) {
1132                         break;
1133                 }
1134         }
1135
1136         next_ret.notification = create_notif_from_line(dmesg_comp,
1137                 dmesg_notif_iter->linebuf);
1138         if (!next_ret.notification) {
1139                 BT_LOGE("Cannot create event notification from line: "
1140                         "dmesg-comp-addr=%p, line=\"%s\"", dmesg_comp,
1141                         dmesg_notif_iter->linebuf);
1142         }
1143
1144 end:
1145         return next_ret;
1146 }