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