src/journal/sd-journal.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <stddef.h>
  25 #include <unistd.h>
  26 #include <sys/inotify.h>
  27
  28 #include "sd-journal.h"
  29 #include "journal-def.h"
  30 #include "journal-file.h"
  31 #include "hashmap.h"
  32 #include "list.h"
  33 #include "lookup3.h"
  34 #include "compress.h"
  35 #include "journal-internal.h"
  36
  37 #define JOURNAL_FILES_MAX 1024
  38
  39 static void detach_location(sd_journal *j) {
  40         Iterator i;
  41         JournalFile *f;
  42
  43         assert(j);
  44
  45         j->current_file = NULL;
  46         j->current_field = 0;
  47
  48         HASHMAP_FOREACH(f, j->files, i)
  49                 f->current_offset = 0;
  50 }
  51
  52 static void reset_location(sd_journal *j) {
  53         assert(j);
  54
  55         detach_location(j);
  56         zero(j->current_location);
  57 }
  58
  59 static void init_location(Location *l, JournalFile *f, Object *o) {
  60         assert(l);
  61         assert(f);
  62         assert(o->object.type == OBJECT_ENTRY);
  63
  64         l->type = LOCATION_DISCRETE;
  65         l->seqnum = le64toh(o->entry.seqnum);
  66         l->seqnum_id = f->header->seqnum_id;
  67         l->realtime = le64toh(o->entry.realtime);
  68         l->monotonic = le64toh(o->entry.monotonic);
  69         l->boot_id = le64toh(o->entry.boot_id);
  70         l->xor_hash = le64toh(o->entry.xor_hash);
  71
  72         l->seqnum_set = l->realtime_set = l->monotonic_set = l->xor_hash_set = true;
  73 }
  74
  75 static void set_location(sd_journal *j, JournalFile *f, Object *o, uint64_t offset) {
  76         assert(j);
  77         assert(f);
  78         assert(o);
  79
  80         init_location(&j->current_location, f, o);
  81
  82         j->current_file = f;
  83         j->current_field = 0;
  84
  85         f->current_offset = offset;
  86 }
  87
  88 static int same_field(const void *_a, size_t s, const void *_b, size_t t) {
  89         const uint8_t *a = _a, *b = _b;
  90         size_t j;
  91         bool a_good = false, b_good = false, different = false;
  92
  93         for (j = 0; j < s && j < t; j++) {
  94
  95                 if (a[j] == '=')
  96                         a_good = true;
  97                 if (b[j] == '=')
  98                         b_good = true;
  99                 if (a[j] != b[j])
 100                         different = true;
 101
 102                 if (a_good && b_good)
 103                         return different ? 0 : 1;
 104         }
 105
 106         return -EINVAL;
 107 }
 108
 109 _public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
 110         Match *m, *after = NULL;
 111         uint64_t le_hash;
 112
 113         if (!j)
 114                 return -EINVAL;
 115         if (!data)
 116                 return -EINVAL;
 117         if (size <= 0)
 118                 return -EINVAL;
 119
 120         le_hash = htole64(hash64(data, size));
 121
 122         LIST_FOREACH(matches, m, j->matches) {
 123                 int r;
 124
 125                 if (m->le_hash == le_hash &&
 126                     m->size == size &&
 127                     memcmp(m->data, data, size) == 0)
 128                         return 0;
 129
 130                 r = same_field(data, size, m->data, m->size);
 131                 if (r < 0)
 132                         return r;
 133                 else if (r > 0)
 134                         after = m;
 135         }
 136
 137         m = new0(Match, 1);
 138         if (!m)
 139                 return -ENOMEM;
 140
 141         m->size = size;
 142
 143         m->data = malloc(m->size);
 144         if (!m->data) {
 145                 free(m);
 146                 return -ENOMEM;
 147         }
 148
 149         memcpy(m->data, data, size);
 150         m->le_hash = le_hash;
 151
 152         /* Matches for the same fields we order adjacent to each
 153          * other */
 154         LIST_INSERT_AFTER(Match, matches, j->matches, after, m);
 155         j->n_matches ++;
 156
 157         detach_location(j);
 158
 159         return 0;
 160 }
 161
 162 _public_ void sd_journal_flush_matches(sd_journal *j) {
 163         if (!j)
 164                 return;
 165
 166         while (j->matches) {
 167                 Match *m = j->matches;
 168
 169                 LIST_REMOVE(Match, matches, j->matches, m);
 170                 free(m->data);
 171                 free(m);
 172         }
 173
 174         j->n_matches = 0;
 175
 176         detach_location(j);
 177 }
 178
 179 static int compare_order(JournalFile *af, Object *ao,
 180                          JournalFile *bf, Object *bo) {
 181
 182         uint64_t a, b;
 183
 184         assert(af);
 185         assert(ao);
 186         assert(bf);
 187         assert(bo);
 188
 189         /* We operate on two different files here, hence we can access
 190          * two objects at the same time, which we normally can't.
 191          *
 192          * If contents and timestamps match, these entries are
 193          * identical, even if the seqnum does not match */
 194
 195         if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id) &&
 196             ao->entry.monotonic == bo->entry.monotonic &&
 197             ao->entry.realtime == bo->entry.realtime &&
 198             ao->entry.xor_hash == bo->entry.xor_hash)
 199                 return 0;
 200
 201         if (sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id)) {
 202
 203                 /* If this is from the same seqnum source, compare
 204                  * seqnums */
 205                 a = le64toh(ao->entry.seqnum);
 206                 b = le64toh(bo->entry.seqnum);
 207
 208                 if (a < b)
 209                         return -1;
 210                 if (a > b)
 211                         return 1;
 212
 213                 /* Wow! This is weird, different data but the same
 214                  * seqnums? Something is borked, but let's make the
 215                  * best of it and compare by time. */
 216         }
 217
 218         if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id)) {
 219
 220                 /* If the boot id matches compare monotonic time */
 221                 a = le64toh(ao->entry.monotonic);
 222                 b = le64toh(bo->entry.monotonic);
 223
 224                 if (a < b)
 225                         return -1;
 226                 if (a > b)
 227                         return 1;
 228         }
 229
 230         /* Otherwise compare UTC time */
 231         a = le64toh(ao->entry.realtime);
 232         b = le64toh(ao->entry.realtime);
 233
 234         if (a < b)
 235                 return -1;
 236         if (a > b)
 237                 return 1;
 238
 239         /* Finally, compare by contents */
 240         a = le64toh(ao->entry.xor_hash);
 241         b = le64toh(ao->entry.xor_hash);
 242
 243         if (a < b)
 244                 return -1;
 245         if (a > b)
 246                 return 1;
 247
 248         return 0;
 249 }
 250
 251 static int compare_with_location(JournalFile *af, Object *ao, Location *l) {
 252         uint64_t a;
 253
 254         assert(af);
 255         assert(ao);
 256         assert(l);
 257         assert(l->type == LOCATION_DISCRETE);
 258
 259         if (l->monotonic_set &&
 260             sd_id128_equal(ao->entry.boot_id, l->boot_id) &&
 261             l->realtime_set &&
 262             le64toh(ao->entry.realtime) == l->realtime &&
 263             l->xor_hash_set &&
 264             le64toh(ao->entry.xor_hash) == l->xor_hash)
 265                 return 0;
 266
 267         if (l->seqnum_set &&
 268             sd_id128_equal(af->header->seqnum_id, l->seqnum_id)) {
 269
 270                 a = le64toh(ao->entry.seqnum);
 271
 272                 if (a < l->seqnum)
 273                         return -1;
 274                 if (a > l->seqnum)
 275                         return 1;
 276         }
 277
 278         if (l->monotonic_set &&
 279             sd_id128_equal(ao->entry.boot_id, l->boot_id)) {
 280
 281                 a = le64toh(ao->entry.monotonic);
 282
 283                 if (a < l->monotonic)
 284                         return -1;
 285                 if (a > l->monotonic)
 286                         return 1;
 287         }
 288
 289         if (l->realtime_set) {
 290
 291                 a = le64toh(ao->entry.realtime);
 292
 293                 if (a < l->realtime)
 294                         return -1;
 295                 if (a > l->realtime)
 296                         return 1;
 297         }
 298
 299         if (l->xor_hash_set) {
 300                 a = le64toh(ao->entry.xor_hash);
 301
 302                 if (a < l->xor_hash)
 303                         return -1;
 304                 if (a > l->xor_hash)
 305                         return 1;
 306         }
 307
 308         return 0;
 309 }
 310
 311 static int find_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
 312         Object *o = NULL;
 313         uint64_t p = 0;
 314         int r;
 315
 316         assert(j);
 317
 318         if (!j->matches) {
 319                 /* No matches is simple */
 320
 321                 if (j->current_location.type == LOCATION_HEAD)
 322                         r = journal_file_next_entry(f, NULL, 0, DIRECTION_DOWN, &o, &p);
 323                 else if (j->current_location.type == LOCATION_TAIL)
 324                         r = journal_file_next_entry(f, NULL, 0, DIRECTION_UP, &o, &p);
 325                 else if (j->current_location.seqnum_set &&
 326                          sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
 327                         r = journal_file_move_to_entry_by_seqnum(f, j->current_location.seqnum, direction, &o, &p);
 328                 else if (j->current_location.monotonic_set)
 329                         r = journal_file_move_to_entry_by_monotonic(f, j->current_location.boot_id, j->current_location.monotonic, direction, &o, &p);
 330                 else if (j->current_location.realtime_set)
 331                         r = journal_file_move_to_entry_by_realtime(f, j->current_location.realtime, direction, &o, &p);
 332                 else
 333                         r = journal_file_next_entry(f, NULL, 0, direction, &o, &p);
 334
 335                 if (r <= 0)
 336                         return r;
 337
 338         } else  {
 339                 Match *m, *term_match = NULL;
 340                 Object *to = NULL;
 341                 uint64_t tp = 0;
 342
 343                 /* We have matches, first, let's jump to the monotonic
 344                  * position if we have any, since it implies a
 345                  * match. */
 346
 347                 if (j->current_location.type == LOCATION_DISCRETE &&
 348                     j->current_location.monotonic_set) {
 349
 350                         r = journal_file_move_to_entry_by_monotonic(f, j->current_location.boot_id, j->current_location.monotonic, direction, &o, &p);
 351                         if (r <= 0)
 352                                 return r == -ENOENT ? 0 : r;
 353                 }
 354
 355                 LIST_FOREACH(matches, m, j->matches) {
 356                         Object *c, *d;
 357                         uint64_t cp, dp;
 358
 359                         r = journal_file_find_data_object_with_hash(f, m->data, m->size, m->le_hash, &d, &dp);
 360                         if (r <= 0)
 361                                 return r;
 362
 363                         if (j->current_location.type == LOCATION_HEAD)
 364                                 r = journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_DOWN, &c, &cp);
 365                         else if (j->current_location.type == LOCATION_TAIL)
 366                                 r = journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_UP, &c, &cp);
 367                         else if (j->current_location.seqnum_set &&
 368                                  sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id))
 369                                 r = journal_file_move_to_entry_by_seqnum_for_data(f, dp, j->current_location.seqnum, direction, &c, &cp);
 370                         else if (j->current_location.realtime_set)
 371                                 r = journal_file_move_to_entry_by_realtime_for_data(f, dp, j->current_location.realtime, direction, &c, &cp);
 372                         else
 373                                 r = journal_file_next_entry_for_data(f, NULL, 0, dp, direction, &c, &cp);
 374
 375                         if (!term_match) {
 376                                 term_match = m;
 377
 378                                 if (r > 0) {
 379                                         to = c;
 380                                         tp = cp;
 381                                 }
 382                         } else if (same_field(term_match->data, term_match->size, m->data, m->size)) {
 383
 384                                 /* Same field as previous match... */
 385                                 if (r > 0) {
 386
 387                                         /* Find the earliest of the OR matches */
 388
 389                                         if (!to ||
 390                                             (direction == DIRECTION_DOWN && cp < tp) ||
 391                                             (direction == DIRECTION_UP && cp > tp)) {
 392                                                 to = c;
 393                                                 tp = cp;
 394                                         }
 395
 396                                 }
 397
 398                         } else {
 399
 400                                 /* Previous term is finished, did anything match? */
 401                                 if (!to)
 402                                         return 0;
 403
 404                                 /* Find the last of the AND matches */
 405                                 if (!o ||
 406                                     (direction == DIRECTION_DOWN && tp > p) ||
 407                                     (direction == DIRECTION_UP && tp < p)) {
 408                                         o = to;
 409                                         p = tp;
 410                                 }
 411
 412                                 term_match = m;
 413
 414                                 if (r > 0) {
 415                                         to = c;
 416                                         tp = cp;
 417                                 } else {
 418                                         to = NULL;
 419                                         tp = 0;
 420                                 }
 421                         }
 422                 }
 423
 424                 /* Last term is finished, did anything match? */
 425                 if (!to)
 426                         return 0;
 427
 428                 if (!o ||
 429                     (direction == DIRECTION_DOWN && tp > p) ||
 430                     (direction == DIRECTION_UP && tp < p)) {
 431                         o = to;
 432                         p = tp;
 433                 }
 434
 435                 if (!o)
 436                         return 0;
 437         }
 438
 439         if (ret)
 440                 *ret = o;
 441
 442         if (offset)
 443                 *offset = p;
 444
 445         return 1;
 446 }
 447
 448 static int next_with_matches(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
 449         int r;
 450         uint64_t cp;
 451         Object *c;
 452
 453         assert(j);
 454         assert(f);
 455         assert(ret);
 456         assert(offset);
 457
 458         c = *ret;
 459         cp = *offset;
 460
 461         if (!j->matches) {
 462                 /* No matches is easy */
 463
 464                 r = journal_file_next_entry(f, c, cp, direction, &c, &cp);
 465                 if (r <= 0)
 466                         return r;
 467
 468                 if (ret)
 469                         *ret = c;
 470                 if (offset)
 471                         *offset = cp;
 472                 return 1;
 473         }
 474
 475         /* So there are matches we have to adhere to, let's find the
 476          * first entry that matches all of them */
 477
 478         for (;;) {
 479                 uint64_t np, n;
 480                 bool found, term_result = false;
 481                 Match *m, *term_match = NULL;
 482                 Object *npo = NULL;
 483
 484                 n = journal_file_entry_n_items(c);
 485
 486                 /* Make sure we don't match the entry we are starting
 487                  * from. */
 488                 found = cp > *offset;
 489
 490                 np = 0;
 491                 LIST_FOREACH(matches, m, j->matches) {
 492                         uint64_t q, k;
 493                         Object *qo = NULL;
 494
 495                         /* Let's check if this is the beginning of a
 496                          * new term, i.e. has a different field prefix
 497                          * as the preceeding match. */
 498                         if (!term_match) {
 499                                 term_match = m;
 500                                 term_result = false;
 501                         } else if (!same_field(term_match->data, term_match->size, m->data, m->size)) {
 502                                 if (!term_result)
 503                                         found = false;
 504
 505                                 term_match = m;
 506                                 term_result = false;
 507                         }
 508
 509                         for (k = 0; k < n; k++)
 510                                 if (c->entry.items[k].hash == m->le_hash)
 511                                         break;
 512
 513                         if (k >= n) {
 514                                 /* Hmm, didn't find any field that
 515                                  * matched this rule, so ignore this
 516                                  * match. Go on with next match */
 517                                 continue;
 518                         }
 519
 520                         term_result = true;
 521
 522                         /* Hmm, so, this field matched, let's remember
 523                          * where we'd have to try next, in case the other
 524                          * matches are not OK */
 525
 526                         r = journal_file_next_entry_for_data(f, c, cp, le64toh(c->entry.items[k].object_offset), direction, &qo, &q);
 527                         if (r < 0)
 528                                 return r;
 529
 530                         if (r > 0) {
 531
 532                                 if (direction == DIRECTION_DOWN) {
 533                                         if (q > np) {
 534                                                 np = q;
 535                                                 npo = qo;
 536                                         }
 537                                 } else {
 538                                         if (np == 0 || q < np) {
 539                                                 np = q;
 540                                                 npo = qo;
 541                                         }
 542                                 }
 543                         }
 544                 }
 545
 546                 /* Check the last term */
 547                 if (term_match && !term_result)
 548                         found = false;
 549
 550                 /* Did this entry match against all matches? */
 551                 if (found) {
 552                         if (ret)
 553                                 *ret = c;
 554                         if (offset)
 555                                 *offset = cp;
 556                         return 1;
 557                 }
 558
 559                 /* Did we find a subsequent entry? */
 560                 if (np == 0)
 561                         return 0;
 562
 563                 /* Hmm, ok, this entry only matched partially, so
 564                  * let's try another one */
 565                 cp = np;
 566                 c = npo;
 567         }
 568 }
 569
 570 static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
 571         Object *c;
 572         uint64_t cp;
 573         int compare_value, r;
 574
 575         assert(j);
 576         assert(f);
 577
 578         if (f->current_offset > 0) {
 579                 cp = f->current_offset;
 580
 581                 r = journal_file_move_to_object(f, OBJECT_ENTRY, cp, &c);
 582                 if (r < 0)
 583                         return r;
 584
 585                 r = next_with_matches(j, f, direction, &c, &cp);
 586                 if (r <= 0)
 587                         return r;
 588
 589                 compare_value = 1;
 590         } else {
 591                 r = find_location(j, f, direction, &c, &cp);
 592                 if (r <= 0)
 593                         return r;
 594
 595                 compare_value = 0;
 596         }
 597
 598         for (;;) {
 599                 bool found;
 600
 601                 if (j->current_location.type == LOCATION_DISCRETE) {
 602                         int k;
 603
 604                         k = compare_with_location(f, c, &j->current_location);
 605                         if (direction == DIRECTION_DOWN)
 606                                 found = k >= compare_value;
 607                         else
 608                                 found = k <= -compare_value;
 609                 } else
 610                         found = true;
 611
 612                 if (found) {
 613                         if (ret)
 614                                 *ret = c;
 615                         if (offset)
 616                                 *offset = cp;
 617                         return 1;
 618                 }
 619
 620                 r = next_with_matches(j, f, direction, &c, &cp);
 621                 if (r <= 0)
 622                         return r;
 623         }
 624 }
 625
 626 static int real_journal_next(sd_journal *j, direction_t direction) {
 627         JournalFile *f, *new_current = NULL;
 628         Iterator i;
 629         int r;
 630         uint64_t new_offset = 0;
 631         Object *new_entry = NULL;
 632
 633         if (!j)
 634                 return -EINVAL;
 635
 636         HASHMAP_FOREACH(f, j->files, i) {
 637                 Object *o;
 638                 uint64_t p;
 639                 bool found;
 640
 641                 r = next_beyond_location(j, f, direction, &o, &p);
 642                 if (r < 0)
 643                         return r;
 644                 else if (r == 0)
 645                         continue;
 646
 647                 if (!new_current)
 648                         found = true;
 649                 else {
 650                         int k;
 651
 652                         k = compare_order(f, o, new_current, new_entry);
 653
 654                         if (direction == DIRECTION_DOWN)
 655                                 found = k < 0;
 656                         else
 657                                 found = k > 0;
 658                 }
 659
 660                 if (found) {
 661                         new_current = f;
 662                         new_entry = o;
 663                         new_offset = p;
 664                 }
 665         }
 666
 667         if (!new_current)
 668                 return 0;
 669
 670         set_location(j, new_current, new_entry, new_offset);
 671
 672         return 1;
 673 }
 674
 675 _public_ int sd_journal_next(sd_journal *j) {
 676         return real_journal_next(j, DIRECTION_DOWN);
 677 }
 678
 679 _public_ int sd_journal_previous(sd_journal *j) {
 680         return real_journal_next(j, DIRECTION_UP);
 681 }
 682
 683 _public_ int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
 684         int c = 0, r;
 685
 686         if (!j)
 687                 return -EINVAL;
 688
 689         while (skip > 0) {
 690                 r = sd_journal_next(j);
 691                 if (r < 0)
 692                         return r;
 693
 694                 if (r == 0)
 695                         return c;
 696
 697                 skip--;
 698                 c++;
 699         }
 700
 701         return c;
 702 }
 703
 704 _public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
 705         int c = 0, r;
 706
 707         if (!j)
 708                 return -EINVAL;
 709
 710         while (skip > 0) {
 711                 r = sd_journal_previous(j);
 712                 if (r < 0)
 713                         return r;
 714
 715                 if (r == 0)
 716                         return c;
 717
 718                 skip--;
 719                 c++;
 720         }
 721
 722         return 1;
 723 }
 724
 725 _public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
 726         Object *o;
 727         int r;
 728         char bid[33], sid[33];
 729
 730         if (!j)
 731                 return -EINVAL;
 732         if (!cursor)
 733                 return -EINVAL;
 734
 735         if (!j->current_file || j->current_file->current_offset <= 0)
 736                 return -EADDRNOTAVAIL;
 737
 738         r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
 739         if (r < 0)
 740                 return r;
 741
 742         sd_id128_to_string(j->current_file->header->seqnum_id, sid);
 743         sd_id128_to_string(o->entry.boot_id, bid);
 744
 745         if (asprintf(cursor,
 746                      "s=%s;i=%llx;b=%s;m=%llx;t=%llx;x=%llx;p=%s",
 747                      sid, (unsigned long long) le64toh(o->entry.seqnum),
 748                      bid, (unsigned long long) le64toh(o->entry.monotonic),
 749                      (unsigned long long) le64toh(o->entry.realtime),
 750                      (unsigned long long) le64toh(o->entry.xor_hash),
 751                      file_name_from_path(j->current_file->path)) < 0)
 752                 return -ENOMEM;
 753
 754         return 1;
 755 }
 756
 757 _public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
 758         char *w;
 759         size_t l;
 760         char *state;
 761         unsigned long long seqnum, monotonic, realtime, xor_hash;
 762         bool
 763                 seqnum_id_set = false,
 764                 seqnum_set = false,
 765                 boot_id_set = false,
 766                 monotonic_set = false,
 767                 realtime_set = false,
 768                 xor_hash_set = false;
 769         sd_id128_t seqnum_id, boot_id;
 770
 771         if (!j)
 772                 return -EINVAL;
 773         if (!cursor)
 774                 return -EINVAL;
 775
 776         FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
 777                 char *item;
 778                 int k = 0;
 779
 780                 if (l < 2 || w[1] != '=')
 781                         return -EINVAL;
 782
 783                 item = strndup(w, l);
 784                 if (!item)
 785                         return -ENOMEM;
 786
 787                 switch (w[0]) {
 788
 789                 case 's':
 790                         seqnum_id_set = true;
 791                         k = sd_id128_from_string(w+2, &seqnum_id);
 792                         break;
 793
 794                 case 'i':
 795                         seqnum_set = true;
 796                         if (sscanf(w+2, "%llx", &seqnum) != 1)
 797                                 k = -EINVAL;
 798                         break;
 799
 800                 case 'b':
 801                         boot_id_set = true;
 802                         k = sd_id128_from_string(w+2, &boot_id);
 803                         break;
 804
 805                 case 'm':
 806                         monotonic_set = true;
 807                         if (sscanf(w+2, "%llx", &monotonic) != 1)
 808                                 k = -EINVAL;
 809                         break;
 810
 811                 case 't':
 812                         realtime_set = true;
 813                         if (sscanf(w+2, "%llx", &realtime) != 1)
 814                                 k = -EINVAL;
 815                         break;
 816
 817                 case 'x':
 818                         xor_hash_set = true;
 819                         if (sscanf(w+2, "%llx", &xor_hash) != 1)
 820                                 k = -EINVAL;
 821                         break;
 822                 }
 823
 824                 free(item);
 825
 826                 if (k < 0)
 827                         return k;
 828         }
 829
 830         if ((!seqnum_set || !seqnum_id_set) &&
 831             (!monotonic_set || !boot_id_set) &&
 832             !realtime_set)
 833                 return -EINVAL;
 834
 835         reset_location(j);
 836
 837         j->current_location.type = LOCATION_DISCRETE;
 838
 839         if (realtime_set) {
 840                 j->current_location.realtime = (uint64_t) realtime;
 841                 j->current_location.realtime_set = true;
 842         }
 843
 844         if (seqnum_set && seqnum_id_set) {
 845                 j->current_location.seqnum = (uint64_t) seqnum;
 846                 j->current_location.seqnum_id = seqnum_id;
 847                 j->current_location.seqnum_set = true;
 848         }
 849
 850         if (monotonic_set && boot_id_set) {
 851                 j->current_location.monotonic = (uint64_t) monotonic;
 852                 j->current_location.boot_id = boot_id;
 853                 j->current_location.monotonic_set = true;
 854         }
 855
 856         if (xor_hash_set) {
 857                 j->current_location.xor_hash = (uint64_t) xor_hash;
 858                 j->current_location.xor_hash_set = true;
 859         }
 860
 861         return 0;
 862 }
 863
 864 _public_ int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t usec) {
 865         if (!j)
 866                 return -EINVAL;
 867
 868         reset_location(j);
 869         j->current_location.type = LOCATION_DISCRETE;
 870         j->current_location.boot_id = boot_id;
 871         j->current_location.monotonic = usec;
 872         j->current_location.monotonic_set = true;
 873
 874         return 0;
 875 }
 876
 877 _public_ int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) {
 878         if (!j)
 879                 return -EINVAL;
 880
 881         reset_location(j);
 882         j->current_location.type = LOCATION_DISCRETE;
 883         j->current_location.realtime = usec;
 884         j->current_location.realtime_set = true;
 885
 886         return 0;
 887 }
 888
 889 _public_ int sd_journal_seek_head(sd_journal *j) {
 890         if (!j)
 891                 return -EINVAL;
 892
 893         reset_location(j);
 894         j->current_location.type = LOCATION_HEAD;
 895
 896         return 0;
 897 }
 898
 899 _public_ int sd_journal_seek_tail(sd_journal *j) {
 900         if (!j)
 901                 return -EINVAL;
 902
 903         reset_location(j);
 904         j->current_location.type = LOCATION_TAIL;
 905
 906         return 0;
 907 }
 908
 909 static int add_file(sd_journal *j, const char *prefix, const char *dir, const char *filename) {
 910         char *fn;
 911         int r;
 912         JournalFile *f;
 913
 914         assert(j);
 915         assert(prefix);
 916         assert(filename);
 917
 918         if ((j->flags & SD_JOURNAL_SYSTEM_ONLY) &&
 919             !startswith(filename, "system.journal"))
 920                 return 0;
 921
 922         if (dir)
 923                 fn = join(prefix, "/", dir, "/", filename, NULL);
 924         else
 925                 fn = join(prefix, "/", filename, NULL);
 926
 927         if (!fn)
 928                 return -ENOMEM;
 929
 930         if (hashmap_get(j->files, fn)) {
 931                 free(fn);
 932                 return 0;
 933         }
 934
 935         if (hashmap_size(j->files) >= JOURNAL_FILES_MAX) {
 936                 log_debug("Too many open journal files, not adding %s, ignoring.", fn);
 937                 free(fn);
 938                 return 0;
 939         }
 940
 941         r = journal_file_open(fn, O_RDONLY, 0, NULL, &f);
 942         free(fn);
 943
 944         if (r < 0) {
 945                 if (errno == ENOENT)
 946                         return 0;
 947
 948                 return r;
 949         }
 950
 951         /* journal_file_dump(f); */
 952
 953         r = hashmap_put(j->files, f->path, f);
 954         if (r < 0) {
 955                 journal_file_close(f);
 956                 return r;
 957         }
 958
 959         log_debug("File %s got added.", f->path);
 960
 961         return 0;
 962 }
 963
 964 static int remove_file(sd_journal *j, const char *prefix, const char *dir, const char *filename) {
 965         char *fn;
 966         JournalFile *f;
 967
 968         assert(j);
 969         assert(prefix);
 970         assert(filename);
 971
 972         if (dir)
 973                 fn = join(prefix, "/", dir, "/", filename, NULL);
 974         else
 975                 fn = join(prefix, "/", filename, NULL);
 976
 977         if (!fn)
 978                 return -ENOMEM;
 979
 980         f = hashmap_get(j->files, fn);
 981         free(fn);
 982
 983         if (!f)
 984                 return 0;
 985
 986         hashmap_remove(j->files, f->path);
 987         journal_file_close(f);
 988
 989         log_debug("File %s got removed.", f->path);
 990         return 0;
 991 }
 992
 993 static int add_directory(sd_journal *j, const char *prefix, const char *dir) {
 994         char *fn;
 995         int r;
 996         DIR *d;
 997         int wd;
 998         sd_id128_t id, mid;
 999
1000         assert(j);
1001         assert(prefix);
1002         assert(dir);
1003
1004         if ((j->flags & SD_JOURNAL_LOCAL_ONLY) &&
1005             (sd_id128_from_string(dir, &id) < 0 ||
1006              sd_id128_get_machine(&mid) < 0 ||
1007              !sd_id128_equal(id, mid)))
1008             return 0;
1009
1010         fn = join(prefix, "/", dir, NULL);
1011         if (!fn)
1012                 return -ENOMEM;
1013
1014         d = opendir(fn);
1015
1016         if (!d) {
1017                 free(fn);
1018                 if (errno == ENOENT)
1019                         return 0;
1020
1021                 return -errno;
1022         }
1023
1024         wd = inotify_add_watch(j->inotify_fd, fn,
1025                                IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
1026                                IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|
1027                                IN_DONT_FOLLOW|IN_ONLYDIR);
1028         if (wd > 0) {
1029                 if (hashmap_put(j->inotify_wd_dirs, INT_TO_PTR(wd), fn) < 0)
1030                         inotify_rm_watch(j->inotify_fd, wd);
1031                 else
1032                         fn = NULL;
1033         }
1034
1035         free(fn);
1036
1037         for (;;) {
1038                 struct dirent buf, *de;
1039
1040                 r = readdir_r(d, &buf, &de);
1041                 if (r != 0 || !de)
1042                         break;
1043
1044                 if (!dirent_is_file_with_suffix(de, ".journal"))
1045                         continue;
1046
1047                 r = add_file(j, prefix, dir, de->d_name);
1048                 if (r < 0)
1049                         log_debug("Failed to add file %s/%s/%s: %s", prefix, dir, de->d_name, strerror(-r));
1050         }
1051
1052         closedir(d);
1053
1054         log_debug("Directory %s/%s got added.", prefix, dir);
1055
1056         return 0;
1057 }
1058
1059 static void remove_directory_wd(sd_journal *j, int wd) {
1060         char *p;
1061
1062         assert(j);
1063         assert(wd > 0);
1064
1065         if (j->inotify_fd >= 0)
1066                 inotify_rm_watch(j->inotify_fd, wd);
1067
1068         p = hashmap_remove(j->inotify_wd_dirs, INT_TO_PTR(wd));
1069
1070         if (p) {
1071                 log_debug("Directory %s got removed.", p);
1072                 free(p);
1073         }
1074 }
1075
1076 static void add_root_wd(sd_journal *j, const char *p) {
1077         int wd;
1078         char *k;
1079
1080         assert(j);
1081         assert(p);
1082
1083         wd = inotify_add_watch(j->inotify_fd, p,
1084                                IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
1085                                IN_DONT_FOLLOW|IN_ONLYDIR);
1086         if (wd <= 0)
1087                 return;
1088
1089         k = strdup(p);
1090         if (!k || hashmap_put(j->inotify_wd_roots, INT_TO_PTR(wd), k) < 0) {
1091                 inotify_rm_watch(j->inotify_fd, wd);
1092                 free(k);
1093         }
1094 }
1095
1096 static void remove_root_wd(sd_journal *j, int wd) {
1097         char *p;
1098
1099         assert(j);
1100         assert(wd > 0);
1101
1102         if (j->inotify_fd >= 0)
1103                 inotify_rm_watch(j->inotify_fd, wd);
1104
1105         p = hashmap_remove(j->inotify_wd_roots, INT_TO_PTR(wd));
1106
1107         if (p) {
1108                 log_debug("Root %s got removed.", p);
1109                 free(p);
1110         }
1111 }
1112
1113 _public_ int sd_journal_open(sd_journal **ret, int flags) {
1114         sd_journal *j;
1115         const char *p;
1116         const char search_paths[] =
1117                 "/run/log/journal\0"
1118                 "/var/log/journal\0";
1119         int r;
1120
1121         if (!ret)
1122                 return -EINVAL;
1123
1124         if (flags & ~(SD_JOURNAL_LOCAL_ONLY|
1125                       SD_JOURNAL_RUNTIME_ONLY|
1126                       SD_JOURNAL_SYSTEM_ONLY))
1127                 return -EINVAL;
1128
1129         j = new0(sd_journal, 1);
1130         if (!j)
1131                 return -ENOMEM;
1132
1133         j->flags = flags;
1134
1135         j->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
1136         if (j->inotify_fd < 0) {
1137                 r = -errno;
1138                 goto fail;
1139         }
1140
1141         j->files = hashmap_new(string_hash_func, string_compare_func);
1142         if (!j->files) {
1143                 r = -ENOMEM;
1144                 goto fail;
1145         }
1146
1147         j->inotify_wd_dirs = hashmap_new(trivial_hash_func, trivial_compare_func);
1148         j->inotify_wd_roots = hashmap_new(trivial_hash_func, trivial_compare_func);
1149
1150         if (!j->inotify_wd_dirs || !j->inotify_wd_roots) {
1151                 r = -ENOMEM;
1152                 goto fail;
1153         }
1154
1155         /* We ignore most errors here, since the idea is to only open
1156          * what's actually accessible, and ignore the rest. */
1157
1158         NULSTR_FOREACH(p, search_paths) {
1159                 DIR *d;
1160
1161                 if ((flags & SD_JOURNAL_RUNTIME_ONLY) &&
1162                     !path_startswith(p, "/run"))
1163                         continue;
1164
1165                 d = opendir(p);
1166                 if (!d) {
1167                         if (errno != ENOENT)
1168                                 log_debug("Failed to open %s: %m", p);
1169                         continue;
1170                 }
1171
1172                 add_root_wd(j, p);
1173
1174                 for (;;) {
1175                         struct dirent buf, *de;
1176                         sd_id128_t id;
1177
1178                         r = readdir_r(d, &buf, &de);
1179                         if (r != 0 || !de)
1180                                 break;
1181
1182                         if (dirent_is_file_with_suffix(de, ".journal")) {
1183                                 r = add_file(j, p, NULL, de->d_name);
1184                                 if (r < 0)
1185                                         log_debug("Failed to add file %s/%s: %s", p, de->d_name, strerror(-r));
1186
1187                         } else if ((de->d_type == DT_DIR || de->d_type == DT_UNKNOWN) &&
1188                                    sd_id128_from_string(de->d_name, &id) >= 0) {
1189
1190                                 r = add_directory(j, p, de->d_name);
1191                                 if (r < 0)
1192                                         log_debug("Failed to add directory %s/%s: %s", p, de->d_name, strerror(-r));
1193                         }
1194                 }
1195
1196                 closedir(d);
1197         }
1198
1199         *ret = j;
1200         return 0;
1201
1202 fail:
1203         sd_journal_close(j);
1204
1205         return r;
1206 };
1207
1208 _public_ void sd_journal_close(sd_journal *j) {
1209         if (!j)
1210                 return;
1211
1212         if (j->inotify_wd_dirs) {
1213                 void *k;
1214
1215                 while ((k = hashmap_first_key(j->inotify_wd_dirs)))
1216                         remove_directory_wd(j, PTR_TO_INT(k));
1217
1218                 hashmap_free(j->inotify_wd_dirs);
1219         }
1220
1221         if (j->inotify_wd_roots) {
1222                 void *k;
1223
1224                 while ((k = hashmap_first_key(j->inotify_wd_roots)))
1225                         remove_root_wd(j, PTR_TO_INT(k));
1226
1227                 hashmap_free(j->inotify_wd_roots);
1228         }
1229
1230         if (j->files) {
1231                 JournalFile *f;
1232
1233                 while ((f = hashmap_steal_first(j->files)))
1234                         journal_file_close(f);
1235
1236                 hashmap_free(j->files);
1237         }
1238
1239         sd_journal_flush_matches(j);
1240
1241         if (j->inotify_fd >= 0)
1242                 close_nointr_nofail(j->inotify_fd);
1243
1244         free(j);
1245 }
1246
1247 _public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
1248         Object *o;
1249         JournalFile *f;
1250         int r;
1251
1252         if (!j)
1253                 return -EINVAL;
1254         if (!ret)
1255                 return -EINVAL;
1256
1257         f = j->current_file;
1258         if (!f)
1259                 return -EADDRNOTAVAIL;
1260
1261         if (f->current_offset <= 0)
1262                 return -EADDRNOTAVAIL;
1263
1264         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1265         if (r < 0)
1266                 return r;
1267
1268         *ret = le64toh(o->entry.realtime);
1269         return 0;
1270 }
1271
1272 _public_ int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_boot_id) {
1273         Object *o;
1274         JournalFile *f;
1275         int r;
1276         sd_id128_t id;
1277
1278         if (!j)
1279                 return -EINVAL;
1280         if (!ret)
1281                 return -EINVAL;
1282
1283         f = j->current_file;
1284         if (!f)
1285                 return -EADDRNOTAVAIL;
1286
1287         if (f->current_offset <= 0)
1288                 return -EADDRNOTAVAIL;
1289
1290         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1291         if (r < 0)
1292                 return r;
1293
1294         if (ret_boot_id)
1295                 *ret_boot_id = o->entry.boot_id;
1296         else {
1297                 r = sd_id128_get_boot(&id);
1298                 if (r < 0)
1299                         return r;
1300
1301                 if (!sd_id128_equal(id, o->entry.boot_id))
1302                         return -ENOENT;
1303         }
1304
1305         *ret = le64toh(o->entry.monotonic);
1306         return 0;
1307 }
1308
1309 _public_ int sd_journal_get_data(sd_journal *j, const char *field, const void **data, size_t *size) {
1310         JournalFile *f;
1311         uint64_t i, n;
1312         size_t field_length;
1313         int r;
1314         Object *o;
1315
1316         if (!j)
1317                 return -EINVAL;
1318         if (!field)
1319                 return -EINVAL;
1320         if (!data)
1321                 return -EINVAL;
1322         if (!size)
1323                 return -EINVAL;
1324
1325         if (isempty(field) || strchr(field, '='))
1326                 return -EINVAL;
1327
1328         f = j->current_file;
1329         if (!f)
1330                 return -EADDRNOTAVAIL;
1331
1332         if (f->current_offset <= 0)
1333                 return -EADDRNOTAVAIL;
1334
1335         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1336         if (r < 0)
1337                 return r;
1338
1339         field_length = strlen(field);
1340
1341         n = journal_file_entry_n_items(o);
1342         for (i = 0; i < n; i++) {
1343                 uint64_t p, l, le_hash;
1344                 size_t t;
1345
1346                 p = le64toh(o->entry.items[i].object_offset);
1347                 le_hash = o->entry.items[i].hash;
1348                 r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
1349                 if (r < 0)
1350                         return r;
1351
1352                 if (le_hash != o->data.hash)
1353                         return -EBADMSG;
1354
1355                 l = le64toh(o->object.size) - offsetof(Object, data.payload);
1356
1357                 if (o->object.flags & OBJECT_COMPRESSED) {
1358
1359 #ifdef HAVE_XZ
1360                         if (uncompress_startswith(o->data.payload, l,
1361                                                   &f->compress_buffer, &f->compress_buffer_size,
1362                                                   field, field_length, '=')) {
1363
1364                                 uint64_t rsize;
1365
1366                                 if (!uncompress_blob(o->data.payload, l,
1367                                                      &f->compress_buffer, &f->compress_buffer_size, &rsize))
1368                                         return -EBADMSG;
1369
1370                                 *data = f->compress_buffer;
1371                                 *size = (size_t) rsize;
1372
1373                                 return 0;
1374                         }
1375 #else
1376                         return -EPROTONOSUPPORT;
1377 #endif
1378
1379                 } else if (l >= field_length+1 &&
1380                            memcmp(o->data.payload, field, field_length) == 0 &&
1381                            o->data.payload[field_length] == '=') {
1382
1383                         t = (size_t) l;
1384
1385                         if ((uint64_t) t != l)
1386                                 return -E2BIG;
1387
1388                         *data = o->data.payload;
1389                         *size = t;
1390
1391                         return 0;
1392                 }
1393
1394                 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1395                 if (r < 0)
1396                         return r;
1397         }
1398
1399         return -ENOENT;
1400 }
1401
1402 _public_ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
1403         JournalFile *f;
1404         uint64_t p, l, n, le_hash;
1405         int r;
1406         Object *o;
1407         size_t t;
1408
1409         if (!j)
1410                 return -EINVAL;
1411         if (!data)
1412                 return -EINVAL;
1413         if (!size)
1414                 return -EINVAL;
1415
1416         f = j->current_file;
1417         if (!f)
1418                 return -EADDRNOTAVAIL;
1419
1420         if (f->current_offset <= 0)
1421                 return -EADDRNOTAVAIL;
1422
1423         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1424         if (r < 0)
1425                 return r;
1426
1427         n = journal_file_entry_n_items(o);
1428         if (j->current_field >= n)
1429                 return 0;
1430
1431         p = le64toh(o->entry.items[j->current_field].object_offset);
1432         le_hash = o->entry.items[j->current_field].hash;
1433         r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
1434         if (r < 0)
1435                 return r;
1436
1437         if (le_hash != o->data.hash)
1438                 return -EBADMSG;
1439
1440         l = le64toh(o->object.size) - offsetof(Object, data.payload);
1441         t = (size_t) l;
1442
1443         /* We can't read objects larger than 4G on a 32bit machine */
1444         if ((uint64_t) t != l)
1445                 return -E2BIG;
1446
1447         if (o->object.flags & OBJECT_COMPRESSED) {
1448 #ifdef HAVE_XZ
1449                 uint64_t rsize;
1450
1451                 if (!uncompress_blob(o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, &rsize))
1452                         return -EBADMSG;
1453
1454                 *data = f->compress_buffer;
1455                 *size = (size_t) rsize;
1456 #else
1457                 return -EPROTONOSUPPORT;
1458 #endif
1459         } else {
1460                 *data = o->data.payload;
1461                 *size = t;
1462         }
1463
1464         j->current_field ++;
1465
1466         return 1;
1467 }
1468
1469 _public_ void sd_journal_restart_data(sd_journal *j) {
1470         if (!j)
1471                 return;
1472
1473         j->current_field = 0;
1474 }
1475
1476 _public_ int sd_journal_get_fd(sd_journal *j) {
1477         if (!j)
1478                 return -EINVAL;
1479
1480         return j->inotify_fd;
1481 }
1482
1483 static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
1484         char *p;
1485         int r;
1486
1487         assert(j);
1488         assert(e);
1489
1490         /* Is this a subdirectory we watch? */
1491         p = hashmap_get(j->inotify_wd_dirs, INT_TO_PTR(e->wd));
1492         if (p) {
1493
1494                 if (!(e->mask & IN_ISDIR) && e->len > 0 && endswith(e->name, ".journal")) {
1495
1496                         /* Event for a journal file */
1497
1498                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
1499                                 r = add_file(j, p, NULL, e->name);
1500                                 if (r < 0)
1501                                         log_debug("Failed to add file %s/%s: %s", p, e->name, strerror(-r));
1502                         } else if (e->mask & (IN_DELETE|IN_UNMOUNT)) {
1503
1504                                 r = remove_file(j, p, NULL, e->name);
1505                                 if (r < 0)
1506                                         log_debug("Failed to remove file %s/%s: %s", p, e->name, strerror(-r));
1507                         }
1508
1509                 } else if (e->len == 0) {
1510
1511                         /* Event for the directory itself */
1512
1513                         if (e->mask & (IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT))
1514                                 remove_directory_wd(j, e->wd);
1515                 }
1516
1517                 return;
1518         }
1519
1520         /* Must be the root directory then? */
1521         p = hashmap_get(j->inotify_wd_roots, INT_TO_PTR(e->wd));
1522         if (p) {
1523                 sd_id128_t id;
1524
1525                 if (!(e->mask & IN_ISDIR) && e->len > 0 && endswith(e->name, ".journal")) {
1526
1527                         /* Event for a journal file */
1528
1529                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
1530                                 r = add_file(j, p, NULL, e->name);
1531                                 if (r < 0)
1532                                         log_debug("Failed to add file %s/%s: %s", p, e->name, strerror(-r));
1533                         } else if (e->mask & (IN_DELETE|IN_UNMOUNT)) {
1534
1535                                 r = remove_file(j, p, NULL, e->name);
1536                                 if (r < 0)
1537                                         log_debug("Failed to remove file %s/%s: %s", p, e->name, strerror(-r));
1538                         }
1539
1540                 } else if ((e->mask & IN_ISDIR) && e->len > 0 && sd_id128_from_string(e->name, &id) >= 0) {
1541
1542                         /* Event for subdirectory */
1543
1544                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
1545
1546                                 r = add_directory(j, p, e->name);
1547                                 if (r < 0)
1548                                         log_debug("Failed to add directory %s/%s: %s", p, e->name, strerror(-r));
1549                         }
1550                 }
1551
1552                 return;
1553         }
1554
1555         if (e->mask & IN_IGNORED)
1556                 return;
1557
1558         log_warning("Unknown inotify event.");
1559 }
1560
1561 _public_ int sd_journal_process(sd_journal *j) {
1562         uint8_t buffer[sizeof(struct inotify_event) + FILENAME_MAX];
1563
1564         if (!j)
1565                 return -EINVAL;
1566
1567         for (;;) {
1568                 struct inotify_event *e;
1569                 ssize_t l;
1570
1571                 l = read(j->inotify_fd, buffer, sizeof(buffer));
1572                 if (l < 0) {
1573                         if (errno == EINTR || errno == EAGAIN)
1574                                 return 0;
1575
1576                         return -errno;
1577                 }
1578
1579                 e = (struct inotify_event*) buffer;
1580                 while (l > 0) {
1581                         size_t step;
1582
1583                         process_inotify_event(j, e);
1584
1585                         step = sizeof(struct inotify_event) + e->len;
1586                         assert(step <= (size_t) l);
1587
1588                         e = (struct inotify_event*) ((uint8_t*) e + step);
1589                         l -= step;
1590                 }
1591         }
1592 }
1593
1594 _public_ int sd_journal_query_unique(sd_journal *j, const char *field) {
1595         if (!j)
1596                 return -EINVAL;
1597         if (!field)
1598                 return -EINVAL;
1599
1600         return -ENOTSUP;
1601 }
1602
1603 _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) {
1604         if (!j)
1605                 return -EINVAL;
1606         if (!data)
1607                 return -EINVAL;
1608         if (!l)
1609                 return -EINVAL;
1610
1611         return -ENOTSUP;
1612 }
1613
1614 _public_ void sd_journal_restart_unique(sd_journal *j) {
1615         if (!j)
1616                 return;
1617 }