plugins/text/dmesg/dmesg.c

   1 /*
   2  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   3  * Copyright 2017 Philippe Proulx <pproulx@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/common-internal.h>
  33 #include <babeltrace/babeltrace.h>
  34 #include <babeltrace/values-internal.h>
  35 #include <babeltrace/compat/utc-internal.h>
  36 #include <babeltrace/compat/stdio-internal.h>
  37 #include <glib.h>
  38
  39 #define NSEC_PER_USEC 1000UL
  40 #define NSEC_PER_MSEC 1000000UL
  41 #define NSEC_PER_SEC 1000000000ULL
  42 #define USEC_PER_SEC 1000000UL
  43
  44 struct dmesg_component;
  45
  46 struct dmesg_notif_iter {
  47         struct dmesg_component *dmesg_comp;
  48         struct bt_self_notification_iterator *pc_notif_iter; /* Weak */
  49         char *linebuf;
  50         size_t linebuf_len;
  51         FILE *fp;
  52         struct bt_private_notification *tmp_event_notif;
  53
  54         enum {
  55                 STATE_EMIT_STREAM_BEGINNING,
  56                 STATE_EMIT_PACKET_BEGINNING,
  57                 STATE_EMIT_EVENT,
  58                 STATE_EMIT_PACKET_END,
  59                 STATE_EMIT_STREAM_END,
  60                 STATE_DONE,
  61         } state;
  62 };
  63
  64 struct dmesg_component {
  65         struct {
  66                 GString *path;
  67                 bt_bool read_from_stdin;
  68                 bt_bool no_timestamp;
  69         } params;
  70
  71         struct bt_trace *trace;
  72         struct bt_stream_class *stream_class;
  73         struct bt_event_class *event_class;
  74         struct bt_stream *stream;
  75         struct bt_packet *packet;
  76         struct bt_clock_class *clock_class;
  77 };
  78
  79 static
  80 struct bt_field_class *create_event_payload_fc(void)
  81 {
  82         struct bt_field_class *root_fc = NULL;
  83         struct bt_field_class *fc = NULL;
  84         int ret;
  85
  86         root_fc = bt_field_class_structure_create();
  87         if (!root_fc) {
  88                 BT_LOGE_STR("Cannot create an empty structure field class object.");
  89                 goto error;
  90         }
  91
  92         fc = bt_field_class_string_create();
  93         if (!fc) {
  94                 BT_LOGE_STR("Cannot create a string field class object.");
  95                 goto error;
  96         }
  97
  98         ret = bt_field_class_structure_append_member(root_fc,
  99                 "str", fc);
 100         if (ret) {
 101                 BT_LOGE("Cannot add `str` member to structure field class: "
 102                         "ret=%d", ret);
 103                 goto error;
 104         }
 105
 106         goto end;
 107
 108 error:
 109         BT_OBJECT_PUT_REF_AND_RESET(root_fc);
 110
 111 end:
 112         bt_object_put_ref(fc);
 113         return root_fc;
 114 }
 115
 116 static
 117 int create_meta(struct dmesg_component *dmesg_comp, bool has_ts)
 118 {
 119         struct bt_field_class *fc = NULL;
 120         const char *trace_name = NULL;
 121         gchar *basename = NULL;
 122         int ret = 0;
 123
 124         dmesg_comp->trace = bt_trace_create();
 125         if (!dmesg_comp->trace) {
 126                 BT_LOGE_STR("Cannot create an empty trace object.");
 127                 goto error;
 128         }
 129
 130         if (dmesg_comp->params.read_from_stdin) {
 131                 trace_name = "STDIN";
 132         } else {
 133                 basename = g_path_get_basename(dmesg_comp->params.path->str);
 134                 BT_ASSERT(basename);
 135
 136                 if (strcmp(basename, G_DIR_SEPARATOR_S) != 0 &&
 137                                 strcmp(basename, ".") != 0) {
 138                         trace_name = basename;
 139                 }
 140         }
 141
 142         if (trace_name) {
 143                 ret = bt_trace_set_name(dmesg_comp->trace, trace_name);
 144                 if (ret) {
 145                         BT_LOGE("Cannot set trace's name: name=\"%s\"", trace_name);
 146                         goto error;
 147                 }
 148         }
 149
 150         dmesg_comp->stream_class = bt_stream_class_create(
 151                 dmesg_comp->trace);
 152         if (!dmesg_comp->stream_class) {
 153                 BT_LOGE_STR("Cannot create a stream class object.");
 154                 goto error;
 155         }
 156
 157         if (has_ts) {
 158                 dmesg_comp->clock_class = bt_clock_class_create();
 159                 if (!dmesg_comp->clock_class) {
 160                         BT_LOGE_STR("Cannot create clock class.");
 161                         goto error;
 162                 }
 163
 164                 ret = bt_stream_class_set_default_clock_class(
 165                         dmesg_comp->stream_class, dmesg_comp->clock_class);
 166                 if (ret) {
 167                         BT_LOGE_STR("Cannot set stream class's default clock class.");
 168                         goto error;
 169                 }
 170         }
 171
 172         dmesg_comp->event_class = bt_event_class_create(
 173                 dmesg_comp->stream_class);
 174         if (!dmesg_comp->event_class) {
 175                 BT_LOGE_STR("Cannot create an event class object.");
 176                 goto error;
 177         }
 178
 179         ret = bt_event_class_set_name(dmesg_comp->event_class, "string");
 180         if (ret) {
 181                 BT_LOGE_STR("Cannot set event class's name.");
 182                 goto error;
 183         }
 184
 185         fc = create_event_payload_fc();
 186         if (!fc) {
 187                 BT_LOGE_STR("Cannot create event payload field class.");
 188                 goto error;
 189         }
 190
 191         ret = bt_event_class_set_payload_field_class(dmesg_comp->event_class, fc);
 192         if (ret) {
 193                 BT_LOGE_STR("Cannot set event class's event payload field class.");
 194                 goto error;
 195         }
 196
 197         goto end;
 198
 199 error:
 200         ret = -1;
 201
 202 end:
 203         bt_object_put_ref(fc);
 204
 205         if (basename) {
 206                 g_free(basename);
 207         }
 208
 209         return ret;
 210 }
 211
 212 static
 213 int handle_params(struct dmesg_component *dmesg_comp,
 214                 const struct bt_value *params)
 215 {
 216         const struct bt_value *no_timestamp = NULL;
 217         const struct bt_value *path = NULL;
 218         const char *path_str;
 219         int ret = 0;
 220
 221         no_timestamp = bt_value_map_borrow_entry_value_const(params,
 222                 "no-extract-timestamp");
 223         if (no_timestamp) {
 224                 if (!bt_value_is_bool(no_timestamp)) {
 225                         BT_LOGE("Expecting a boolean value for the `no-extract-timestamp` parameter: "
 226                                 "type=%s",
 227                                 bt_common_value_type_string(
 228                                         bt_value_get_type(no_timestamp)));
 229                         goto error;
 230                 }
 231
 232                 dmesg_comp->params.no_timestamp =
 233                         bt_value_bool_get(no_timestamp);
 234         }
 235
 236         path = bt_value_map_borrow_entry_value_const(params, "path");
 237         if (path) {
 238                 if (dmesg_comp->params.read_from_stdin) {
 239                         BT_LOGE_STR("Cannot specify both `read-from-stdin` and `path` parameters.");
 240                         goto error;
 241                 }
 242
 243                 if (!bt_value_is_string(path)) {
 244                         BT_LOGE("Expecting a string value for the `path` parameter: "
 245                                 "type=%s",
 246                                 bt_common_value_type_string(
 247                                         bt_value_get_type(path)));
 248                         goto error;
 249                 }
 250
 251                 path_str = bt_value_string_get(path);
 252                 g_string_assign(dmesg_comp->params.path, path_str);
 253         } else {
 254                 dmesg_comp->params.read_from_stdin = true;
 255         }
 256
 257         goto end;
 258
 259 error:
 260         ret = -1;
 261
 262 end:
 263         return ret;
 264 }
 265
 266 static
 267 int create_packet_and_stream(struct dmesg_component *dmesg_comp)
 268 {
 269         int ret = 0;
 270
 271         dmesg_comp->stream = bt_stream_create(dmesg_comp->stream_class);
 272         if (!dmesg_comp->stream) {
 273                 BT_LOGE_STR("Cannot create stream object.");
 274                 goto error;
 275         }
 276
 277         dmesg_comp->packet = bt_packet_create(dmesg_comp->stream);
 278         if (!dmesg_comp->packet) {
 279                 BT_LOGE_STR("Cannot create packet object.");
 280                 goto error;
 281         }
 282
 283         ret = bt_trace_make_static(dmesg_comp->trace);
 284         if (ret) {
 285                 BT_LOGE_STR("Cannot make trace static.");
 286                 goto error;
 287         }
 288
 289         goto end;
 290
 291 error:
 292         ret = -1;
 293
 294 end:
 295         return ret;
 296 }
 297
 298 static
 299 int try_create_meta_stream_packet(struct dmesg_component *dmesg_comp,
 300                 bool has_ts)
 301 {
 302         int ret = 0;
 303
 304         if (dmesg_comp->trace) {
 305                 /* Already created */
 306                 goto end;
 307         }
 308
 309         ret = create_meta(dmesg_comp, has_ts);
 310         if (ret) {
 311                 BT_LOGE("Cannot create metadata objects: dmesg-comp-addr=%p",
 312                         dmesg_comp);
 313                 goto error;
 314         }
 315
 316         ret = create_packet_and_stream(dmesg_comp);
 317         if (ret) {
 318                 BT_LOGE("Cannot create packet and stream objects: "
 319                         "dmesg-comp-addr=%p", dmesg_comp);
 320                 goto error;
 321         }
 322
 323         goto end;
 324
 325 error:
 326         ret = -1;
 327
 328 end:
 329         return ret;
 330 }
 331
 332 static
 333 void destroy_dmesg_component(struct dmesg_component *dmesg_comp)
 334 {
 335         if (!dmesg_comp) {
 336                 return;
 337         }
 338
 339         if (dmesg_comp->params.path) {
 340                 g_string_free(dmesg_comp->params.path, TRUE);
 341         }
 342
 343         bt_object_put_ref(dmesg_comp->packet);
 344         bt_object_put_ref(dmesg_comp->trace);
 345         bt_object_put_ref(dmesg_comp->stream_class);
 346         bt_object_put_ref(dmesg_comp->event_class);
 347         bt_object_put_ref(dmesg_comp->stream);
 348         bt_object_put_ref(dmesg_comp->clock_class);
 349         g_free(dmesg_comp);
 350 }
 351
 352 static
 353 enum bt_self_component_status create_port(
 354                 struct bt_self_component_source *self_comp)
 355 {
 356         return bt_self_component_source_add_output_port(self_comp,
 357                 "out", NULL, NULL);
 358 }
 359
 360 BT_HIDDEN
 361 enum bt_self_component_status dmesg_init(
 362                 struct bt_self_component_source *self_comp,
 363                 struct bt_value *params, void *init_method_data)
 364 {
 365         int ret = 0;
 366         struct dmesg_component *dmesg_comp = g_new0(struct dmesg_component, 1);
 367         enum bt_self_component_status status = BT_SELF_COMPONENT_STATUS_OK;
 368
 369         if (!dmesg_comp) {
 370                 BT_LOGE_STR("Failed to allocate one dmesg component structure.");
 371                 goto error;
 372         }
 373
 374         dmesg_comp->params.path = g_string_new(NULL);
 375         if (!dmesg_comp->params.path) {
 376                 BT_LOGE_STR("Failed to allocate a GString.");
 377                 goto error;
 378         }
 379
 380         ret = handle_params(dmesg_comp, params);
 381         if (ret) {
 382                 BT_LOGE("Invalid parameters: comp-addr=%p", self_comp);
 383                 goto error;
 384         }
 385
 386         if (!dmesg_comp->params.read_from_stdin &&
 387                         !g_file_test(dmesg_comp->params.path->str,
 388                         G_FILE_TEST_IS_REGULAR)) {
 389                 BT_LOGE("Input path is not a regular file: "
 390                         "comp-addr=%p, path=\"%s\"", self_comp,
 391                         dmesg_comp->params.path->str);
 392                 goto error;
 393         }
 394
 395         status = create_port(self_comp);
 396         if (status != BT_SELF_COMPONENT_STATUS_OK) {
 397                 goto error;
 398         }
 399
 400         bt_self_component_set_data(
 401                 bt_self_component_source_as_self_component(self_comp),
 402                 dmesg_comp);
 403         goto end;
 404
 405 error:
 406         destroy_dmesg_component(dmesg_comp);
 407         bt_self_component_set_data(
 408                 bt_self_component_source_as_self_component(self_comp),
 409                 NULL);
 410
 411         if (status >= 0) {
 412                 status = BT_SELF_COMPONENT_STATUS_ERROR;
 413         }
 414
 415 end:
 416         return status;
 417 }
 418
 419 BT_HIDDEN
 420 void dmesg_finalize(struct bt_self_component_source *self_comp)
 421 {
 422         destroy_dmesg_component(bt_self_component_get_data(
 423                 bt_self_component_source_as_self_component(self_comp)));
 424 }
 425
 426 static
 427 struct bt_private_notification *create_init_event_notif_from_line(
 428                 struct dmesg_notif_iter *notif_iter,
 429                 const char *line, const char **new_start)
 430 {
 431         struct bt_event *event;
 432         struct bt_private_notification *notif = NULL;
 433         bool has_timestamp = false;
 434         unsigned long sec, usec, msec;
 435         unsigned int year, mon, mday, hour, min;
 436         uint64_t ts = 0;
 437         int ret = 0;
 438         struct dmesg_component *dmesg_comp = notif_iter->dmesg_comp;
 439
 440         *new_start = line;
 441
 442         if (dmesg_comp->params.no_timestamp) {
 443                 goto skip_ts;
 444         }
 445
 446         /* Extract time from input line */
 447         if (sscanf(line, "[%lu.%lu] ", &sec, &usec) == 2) {
 448                 ts = (uint64_t) sec * USEC_PER_SEC + (uint64_t) usec;
 449
 450                 /*
 451                  * The clock class we use has a 1 GHz frequency: convert
 452                  * from µs to ns.
 453                  */
 454                 ts *= NSEC_PER_USEC;
 455                 has_timestamp = true;
 456         } else if (sscanf(line, "[%u-%u-%u %u:%u:%lu.%lu] ",
 457                         &year, &mon, &mday, &hour, &min,
 458                         &sec, &msec) == 7) {
 459                 time_t ep_sec;
 460                 struct tm ti;
 461
 462                 memset(&ti, 0, sizeof(ti));
 463                 ti.tm_year = year - 1900;       /* From 1900 */
 464                 ti.tm_mon = mon - 1;            /* 0 to 11 */
 465                 ti.tm_mday = mday;
 466                 ti.tm_hour = hour;
 467                 ti.tm_min = min;
 468                 ti.tm_sec = sec;
 469
 470                 ep_sec = bt_timegm(&ti);
 471                 if (ep_sec != (time_t) -1) {
 472                         ts = (uint64_t) ep_sec * NSEC_PER_SEC
 473                                 + (uint64_t) msec * NSEC_PER_MSEC;
 474                 }
 475
 476                 has_timestamp = true;
 477         }
 478
 479         if (has_timestamp) {
 480                 /* Set new start for the message portion of the line */
 481                 *new_start = strchr(line, ']');
 482                 BT_ASSERT(*new_start);
 483                 (*new_start)++;
 484
 485                 if ((*new_start)[0] == ' ') {
 486                         (*new_start)++;
 487                 }
 488         }
 489
 490 skip_ts:
 491         /*
 492          * At this point, we know if the stream class's event header
 493          * field class should have a timestamp or not, so we can lazily
 494          * create the metadata, stream, and packet objects.
 495          */
 496         ret = try_create_meta_stream_packet(dmesg_comp, has_timestamp);
 497         if (ret) {
 498                 /* try_create_meta_stream_packet() logs errors */
 499                 goto error;
 500         }
 501
 502         notif = bt_private_notification_event_create(notif_iter->pc_notif_iter,
 503                 dmesg_comp->event_class, dmesg_comp->packet);
 504         if (!notif) {
 505                 BT_LOGE_STR("Cannot create event notification.");
 506                 goto error;
 507         }
 508
 509         event = bt_private_notification_event_borrow_event(notif);
 510         BT_ASSERT(event);
 511
 512         if (dmesg_comp->clock_class) {
 513                 bt_event_set_default_clock_value(event, ts);
 514         }
 515
 516         goto end;
 517
 518 error:
 519         BT_OBJECT_PUT_REF_AND_RESET(notif);
 520
 521 end:
 522         return notif;
 523 }
 524
 525 static
 526 int fill_event_payload_from_line(const char *line,
 527                 struct bt_event *event)
 528 {
 529         struct bt_field *ep_field = NULL;
 530         struct bt_field *str_field = NULL;
 531         size_t len;
 532         int ret;
 533
 534         ep_field = bt_event_borrow_payload_field(event);
 535         BT_ASSERT(ep_field);
 536         str_field = bt_field_structure_borrow_member_field_by_index(
 537                 ep_field, 0);
 538         if (!str_field) {
 539                 BT_LOGE_STR("Cannot borrow `timestamp` field from event payload structure field.");
 540                 goto error;
 541         }
 542
 543         len = strlen(line);
 544         if (line[len - 1] == '\n') {
 545                 /* Do not include the newline character in the payload */
 546                 len--;
 547         }
 548
 549         ret = bt_field_string_clear(str_field);
 550         if (ret) {
 551                 BT_LOGE_STR("Cannot clear string field object.");
 552                 goto error;
 553         }
 554
 555         ret = bt_field_string_append_with_length(str_field, line, len);
 556         if (ret) {
 557                 BT_LOGE("Cannot append value to string field object: "
 558                         "len=%zu", len);
 559                 goto error;
 560         }
 561
 562         goto end;
 563
 564 error:
 565         ret = -1;
 566
 567 end:
 568         return ret;
 569 }
 570
 571 static
 572 struct bt_private_notification *create_notif_from_line(
 573                 struct dmesg_notif_iter *dmesg_notif_iter, const char *line)
 574 {
 575         struct bt_event *event = NULL;
 576         struct bt_private_notification *notif = NULL;
 577         const char *new_start;
 578         int ret;
 579
 580         notif = create_init_event_notif_from_line(dmesg_notif_iter,
 581                 line, &new_start);
 582         if (!notif) {
 583                 BT_LOGE_STR("Cannot create and initialize event notification from line.");
 584                 goto error;
 585         }
 586
 587         event = bt_private_notification_event_borrow_event(notif);
 588         BT_ASSERT(event);
 589         ret = fill_event_payload_from_line(new_start, event);
 590         if (ret) {
 591                 BT_LOGE("Cannot fill event payload field from line: "
 592                         "ret=%d", ret);
 593                 goto error;
 594         }
 595
 596         goto end;
 597
 598 error:
 599         BT_OBJECT_PUT_REF_AND_RESET(notif);
 600
 601 end:
 602         return notif;
 603 }
 604
 605 static
 606 void destroy_dmesg_notif_iter(struct dmesg_notif_iter *dmesg_notif_iter)
 607 {
 608         if (!dmesg_notif_iter) {
 609                 return;
 610         }
 611
 612         if (dmesg_notif_iter->fp && dmesg_notif_iter->fp != stdin) {
 613                 if (fclose(dmesg_notif_iter->fp)) {
 614                         BT_LOGE_ERRNO("Cannot close input file", ".");
 615                 }
 616         }
 617
 618         bt_object_put_ref(dmesg_notif_iter->tmp_event_notif);
 619         free(dmesg_notif_iter->linebuf);
 620         g_free(dmesg_notif_iter);
 621 }
 622
 623 BT_HIDDEN
 624 enum bt_self_notification_iterator_status dmesg_notif_iter_init(
 625                 struct bt_self_notification_iterator *self_notif_iter,
 626                 struct bt_self_component_source *self_comp,
 627                 struct bt_self_component_port_output *self_port)
 628 {
 629         struct dmesg_component *dmesg_comp;
 630         struct dmesg_notif_iter *dmesg_notif_iter =
 631                 g_new0(struct dmesg_notif_iter, 1);
 632         enum bt_self_notification_iterator_status status =
 633                 BT_SELF_NOTIFICATION_ITERATOR_STATUS_OK;
 634
 635         if (!dmesg_notif_iter) {
 636                 BT_LOGE_STR("Failed to allocate on dmesg notification iterator structure.");
 637                 goto error;
 638         }
 639
 640         dmesg_comp = bt_self_component_get_data(
 641                 bt_self_component_source_as_self_component(self_comp));
 642         BT_ASSERT(dmesg_comp);
 643         dmesg_notif_iter->dmesg_comp = dmesg_comp;
 644         dmesg_notif_iter->pc_notif_iter = self_notif_iter;
 645
 646         if (dmesg_comp->params.read_from_stdin) {
 647                 dmesg_notif_iter->fp = stdin;
 648         } else {
 649                 dmesg_notif_iter->fp = fopen(dmesg_comp->params.path->str, "r");
 650                 if (!dmesg_notif_iter->fp) {
 651                         BT_LOGE_ERRNO("Cannot open input file in read mode", ": path=\"%s\"",
 652                                 dmesg_comp->params.path->str);
 653                         goto error;
 654                 }
 655         }
 656
 657         bt_self_notification_iterator_set_data(self_notif_iter,
 658                 dmesg_notif_iter);
 659         goto end;
 660
 661 error:
 662         destroy_dmesg_notif_iter(dmesg_notif_iter);
 663         bt_self_notification_iterator_set_data(self_notif_iter, NULL);
 664         if (status >= 0) {
 665                 status = BT_SELF_NOTIFICATION_ITERATOR_STATUS_ERROR;
 666         }
 667
 668 end:
 669         return status;
 670 }
 671
 672 BT_HIDDEN
 673 void dmesg_notif_iter_finalize(
 674                 struct bt_self_notification_iterator *priv_notif_iter)
 675 {
 676         destroy_dmesg_notif_iter(bt_self_notification_iterator_get_data(
 677                 priv_notif_iter));
 678 }
 679
 680 static
 681 enum bt_self_notification_iterator_status dmesg_notif_iter_next_one(
 682                 struct dmesg_notif_iter *dmesg_notif_iter,
 683                 struct bt_private_notification **notif)
 684 {
 685         ssize_t len;
 686         struct dmesg_component *dmesg_comp;
 687         enum bt_self_notification_iterator_status status =
 688                 BT_SELF_NOTIFICATION_ITERATOR_STATUS_OK;
 689
 690         BT_ASSERT(dmesg_notif_iter);
 691         dmesg_comp = dmesg_notif_iter->dmesg_comp;
 692         BT_ASSERT(dmesg_comp);
 693
 694         if (dmesg_notif_iter->state == STATE_DONE) {
 695                 status = BT_SELF_NOTIFICATION_ITERATOR_STATUS_END;
 696                 goto end;
 697         }
 698
 699         if (dmesg_notif_iter->tmp_event_notif ||
 700                         dmesg_notif_iter->state == STATE_EMIT_PACKET_END ||
 701                         dmesg_notif_iter->state == STATE_EMIT_STREAM_END) {
 702                 goto handle_state;
 703         }
 704
 705         while (true) {
 706                 const char *ch;
 707                 bool only_spaces = true;
 708
 709                 len = bt_getline(&dmesg_notif_iter->linebuf,
 710                         &dmesg_notif_iter->linebuf_len, dmesg_notif_iter->fp);
 711                 if (len < 0) {
 712                         if (errno == EINVAL) {
 713                                 status = BT_SELF_NOTIFICATION_ITERATOR_STATUS_ERROR;
 714                         } else if (errno == ENOMEM) {
 715                                 status =
 716                                         BT_SELF_NOTIFICATION_ITERATOR_STATUS_NOMEM;
 717                         } else {
 718                                 if (dmesg_notif_iter->state == STATE_EMIT_STREAM_BEGINNING) {
 719                                         /* Stream did not even begin */
 720                                         status = BT_SELF_NOTIFICATION_ITERATOR_STATUS_END;
 721                                         goto end;
 722                                 } else {
 723                                         /* End current packet now */
 724                                         dmesg_notif_iter->state =
 725                                                 STATE_EMIT_PACKET_END;
 726                                         goto handle_state;
 727                                 }
 728                         }
 729
 730                         goto end;
 731                 }
 732
 733                 BT_ASSERT(dmesg_notif_iter->linebuf);
 734
 735                 /* Ignore empty lines, once trimmed */
 736                 for (ch = dmesg_notif_iter->linebuf; *ch != '\0'; ch++) {
 737                         if (!isspace(*ch)) {
 738                                 only_spaces = false;
 739                                 break;
 740                         }
 741                 }
 742
 743                 if (!only_spaces) {
 744                         break;
 745                 }
 746         }
 747
 748         dmesg_notif_iter->tmp_event_notif = create_notif_from_line(
 749                 dmesg_notif_iter, dmesg_notif_iter->linebuf);
 750         if (!dmesg_notif_iter->tmp_event_notif) {
 751                 BT_LOGE("Cannot create event notification from line: "
 752                         "dmesg-comp-addr=%p, line=\"%s\"", dmesg_comp,
 753                         dmesg_notif_iter->linebuf);
 754                 goto end;
 755         }
 756
 757 handle_state:
 758         BT_ASSERT(dmesg_comp->trace);
 759
 760         switch (dmesg_notif_iter->state) {
 761         case STATE_EMIT_STREAM_BEGINNING:
 762                 BT_ASSERT(dmesg_notif_iter->tmp_event_notif);
 763                 *notif = bt_private_notification_stream_begin_create(
 764                         dmesg_notif_iter->pc_notif_iter, dmesg_comp->stream);
 765                 dmesg_notif_iter->state = STATE_EMIT_PACKET_BEGINNING;
 766                 break;
 767         case STATE_EMIT_PACKET_BEGINNING:
 768                 BT_ASSERT(dmesg_notif_iter->tmp_event_notif);
 769                 *notif = bt_private_notification_packet_begin_create(
 770                         dmesg_notif_iter->pc_notif_iter, dmesg_comp->packet);
 771                 dmesg_notif_iter->state = STATE_EMIT_EVENT;
 772                 break;
 773         case STATE_EMIT_EVENT:
 774                 BT_ASSERT(dmesg_notif_iter->tmp_event_notif);
 775                 *notif = dmesg_notif_iter->tmp_event_notif;
 776                 dmesg_notif_iter->tmp_event_notif = NULL;
 777                 break;
 778         case STATE_EMIT_PACKET_END:
 779                 *notif = bt_private_notification_packet_end_create(
 780                         dmesg_notif_iter->pc_notif_iter, dmesg_comp->packet);
 781                 dmesg_notif_iter->state = STATE_EMIT_STREAM_END;
 782                 break;
 783         case STATE_EMIT_STREAM_END:
 784                 *notif = bt_private_notification_stream_end_create(
 785                         dmesg_notif_iter->pc_notif_iter, dmesg_comp->stream);
 786                 dmesg_notif_iter->state = STATE_DONE;
 787                 break;
 788         default:
 789                 break;
 790         }
 791
 792         if (!*notif) {
 793                 BT_LOGE("Cannot create notification: dmesg-comp-addr=%p",
 794                         dmesg_comp);
 795                 status = BT_SELF_NOTIFICATION_ITERATOR_STATUS_ERROR;
 796         }
 797
 798 end:
 799         return status;
 800 }
 801
 802 BT_HIDDEN
 803 enum bt_self_notification_iterator_status dmesg_notif_iter_next(
 804                 struct bt_self_notification_iterator *self_notif_iter,
 805                 bt_notification_array notifs, uint64_t capacity,
 806                 uint64_t *count)
 807 {
 808         struct dmesg_notif_iter *dmesg_notif_iter =
 809                 bt_self_notification_iterator_get_data(
 810                         self_notif_iter);
 811         enum bt_self_notification_iterator_status status =
 812                 BT_SELF_NOTIFICATION_ITERATOR_STATUS_OK;
 813         uint64_t i = 0;
 814
 815         while (i < capacity &&
 816                         status == BT_SELF_NOTIFICATION_ITERATOR_STATUS_OK) {
 817                 struct bt_private_notification *priv_notif = NULL;
 818
 819                 status = dmesg_notif_iter_next_one(dmesg_notif_iter,
 820                         &priv_notif);
 821                 notifs[i] = bt_private_notification_as_notification(
 822                         priv_notif);
 823                 if (status == BT_SELF_NOTIFICATION_ITERATOR_STATUS_OK) {
 824                         i++;
 825                 }
 826         }
 827
 828         if (i > 0) {
 829                 /*
 830                  * Even if dmesg_notif_iter_next_one() returned
 831                  * something else than
 832                  * BT_SELF_NOTIFICATION_ITERATOR_STATUS_OK, we
 833                  * accumulated notification objects in the output
 834                  * notification array, so we need to return
 835                  * BT_SELF_NOTIFICATION_ITERATOR_STATUS_OK so that they
 836                  * are transfered to downstream. This other status
 837                  * occurs again the next time muxer_notif_iter_do_next()
 838                  * is called, possibly without any accumulated
 839                  * notification, in which case we'll return it.
 840                  */
 841                 *count = i;
 842                 status = BT_SELF_NOTIFICATION_ITERATOR_STATUS_OK;
 843         }
 844
 845         return status;
 846 }