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