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 (r < 0)
 376                                 return r;
 377
 378                         if (!term_match) {
 379                                 term_match = m;
 380
 381                                 if (r > 0) {
 382                                         to = c;
 383                                         tp = cp;
 384                                 }
 385                         } else if (same_field(term_match->data, term_match->size, m->data, m->size)) {
 386
 387                                 /* Same field as previous match... */
 388                                 if (r > 0) {
 389
 390                                         /* Find the earliest of the OR matches */
 391
 392                                         if (!to ||
 393                                             (direction == DIRECTION_DOWN && cp < tp) ||
 394                                             (direction == DIRECTION_UP && cp > tp)) {
 395                                                 to = c;
 396                                                 tp = cp;
 397                                         }
 398
 399                                 }
 400
 401                         } else {
 402
 403                                 /* Previous term is finished, did anything match? */
 404                                 if (!to)
 405                                         return 0;
 406
 407                                 /* Find the last of the AND matches */
 408                                 if (!o ||
 409                                     (direction == DIRECTION_DOWN && tp > p) ||
 410                                     (direction == DIRECTION_UP && tp < p)) {
 411                                         o = to;
 412                                         p = tp;
 413                                 }
 414
 415                                 term_match = m;
 416
 417                                 if (r > 0) {
 418                                         to = c;
 419                                         tp = cp;
 420                                 } else {
 421                                         to = NULL;
 422                                         tp = 0;
 423                                 }
 424                         }
 425                 }
 426
 427                 /* Last term is finished, did anything match? */
 428                 if (!to)
 429                         return 0;
 430
 431                 if (!o ||
 432                     (direction == DIRECTION_DOWN && tp > p) ||
 433                     (direction == DIRECTION_UP && tp < p)) {
 434                         o = to;
 435                         p = tp;
 436                 }
 437
 438                 if (!o)
 439                         return 0;
 440         }
 441
 442         if (ret)
 443                 *ret = o;
 444
 445         if (offset)
 446                 *offset = p;
 447
 448         return 1;
 449 }
 450
 451 static int next_with_matches(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
 452         int r;
 453         uint64_t cp;
 454         Object *c;
 455
 456         assert(j);
 457         assert(f);
 458         assert(ret);
 459         assert(offset);
 460
 461         c = *ret;
 462         cp = *offset;
 463
 464         if (!j->matches) {
 465                 /* No matches is easy */
 466
 467                 r = journal_file_next_entry(f, c, cp, direction, &c, &cp);
 468                 if (r <= 0)
 469                         return r;
 470
 471                 if (ret)
 472                         *ret = c;
 473                 if (offset)
 474                         *offset = cp;
 475                 return 1;
 476         }
 477
 478         /* So there are matches we have to adhere to, let's find the
 479          * first entry that matches all of them */
 480
 481         for (;;) {
 482                 uint64_t np, n;
 483                 bool found, term_result = false;
 484                 Match *m, *term_match = NULL;
 485                 Object *npo = NULL;
 486
 487                 n = journal_file_entry_n_items(c);
 488
 489                 /* Make sure we don't match the entry we are starting
 490                  * from. */
 491                 found = cp != *offset;
 492
 493                 np = 0;
 494                 LIST_FOREACH(matches, m, j->matches) {
 495                         uint64_t q, k;
 496                         Object *qo = NULL;
 497
 498                         /* Let's check if this is the beginning of a
 499                          * new term, i.e. has a different field prefix
 500                          * as the preceeding match. */
 501                         if (!term_match) {
 502                                 term_match = m;
 503                                 term_result = false;
 504                         } else if (!same_field(term_match->data, term_match->size, m->data, m->size)) {
 505                                 if (!term_result)
 506                                         found = false;
 507
 508                                 term_match = m;
 509                                 term_result = false;
 510                         }
 511
 512                         for (k = 0; k < n; k++)
 513                                 if (c->entry.items[k].hash == m->le_hash)
 514                                         break;
 515
 516                         if (k >= n) {
 517                                 /* Hmm, didn't find any field that
 518                                  * matched this rule, so ignore this
 519                                  * match. Go on with next match */
 520                                 continue;
 521                         }
 522
 523                         term_result = true;
 524
 525                         /* Hmm, so, this field matched, let's remember
 526                          * where we'd have to try next, in case the other
 527                          * matches are not OK */
 528
 529                         r = journal_file_next_entry_for_data(f, c, cp, le64toh(c->entry.items[k].object_offset), direction, &qo, &q);
 530                         if (r < 0)
 531                                 return r;
 532
 533                         if (r > 0) {
 534
 535                                 if (direction == DIRECTION_DOWN) {
 536                                         if (q > np) {
 537                                                 np = q;
 538                                                 npo = qo;
 539                                         }
 540                                 } else {
 541                                         if (np == 0 || q < np) {
 542                                                 np = q;
 543                                                 npo = qo;
 544                                         }
 545                                 }
 546                         }
 547                 }
 548
 549                 /* Check the last term */
 550                 if (term_match && !term_result)
 551                         found = false;
 552
 553                 /* Did this entry match against all matches? */
 554                 if (found) {
 555                         if (ret)
 556                                 *ret = c;
 557                         if (offset)
 558                                 *offset = cp;
 559                         return 1;
 560                 }
 561
 562                 /* Did we find a subsequent entry? */
 563                 if (np == 0)
 564                         return 0;
 565
 566                 /* Hmm, ok, this entry only matched partially, so
 567                  * let's try another one */
 568                 cp = np;
 569                 c = npo;
 570         }
 571 }
 572
 573 static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) {
 574         Object *c;
 575         uint64_t cp;
 576         int compare_value, r;
 577
 578         assert(j);
 579         assert(f);
 580
 581         if (f->current_offset > 0) {
 582                 cp = f->current_offset;
 583
 584                 r = journal_file_move_to_object(f, OBJECT_ENTRY, cp, &c);
 585                 if (r < 0)
 586                         return r;
 587
 588                 r = next_with_matches(j, f, direction, &c, &cp);
 589                 if (r <= 0)
 590                         return r;
 591
 592                 compare_value = 1;
 593         } else {
 594                 r = find_location(j, f, direction, &c, &cp);
 595                 if (r <= 0)
 596                         return r;
 597
 598                 compare_value = 0;
 599         }
 600
 601         for (;;) {
 602                 bool found;
 603
 604                 if (j->current_location.type == LOCATION_DISCRETE) {
 605                         int k;
 606
 607                         k = compare_with_location(f, c, &j->current_location);
 608                         if (direction == DIRECTION_DOWN)
 609                                 found = k >= compare_value;
 610                         else
 611                                 found = k <= -compare_value;
 612                 } else
 613                         found = true;
 614
 615                 if (found) {
 616                         if (ret)
 617                                 *ret = c;
 618                         if (offset)
 619                                 *offset = cp;
 620                         return 1;
 621                 }
 622
 623                 r = next_with_matches(j, f, direction, &c, &cp);
 624                 if (r <= 0)
 625                         return r;
 626         }
 627 }
 628
 629 static int real_journal_next(sd_journal *j, direction_t direction) {
 630         JournalFile *f, *new_current = NULL;
 631         Iterator i;
 632         int r;
 633         uint64_t new_offset = 0;
 634         Object *new_entry = NULL;
 635
 636         if (!j)
 637                 return -EINVAL;
 638
 639         HASHMAP_FOREACH(f, j->files, i) {
 640                 Object *o;
 641                 uint64_t p;
 642                 bool found;
 643
 644                 r = next_beyond_location(j, f, direction, &o, &p);
 645                 if (r < 0)
 646                         return r;
 647                 else if (r == 0)
 648                         continue;
 649
 650                 if (!new_current)
 651                         found = true;
 652                 else {
 653                         int k;
 654
 655                         k = compare_order(f, o, new_current, new_entry);
 656
 657                         if (direction == DIRECTION_DOWN)
 658                                 found = k < 0;
 659                         else
 660                                 found = k > 0;
 661                 }
 662
 663                 if (found) {
 664                         new_current = f;
 665                         new_entry = o;
 666                         new_offset = p;
 667                 }
 668         }
 669
 670         if (!new_current)
 671                 return 0;
 672
 673         set_location(j, new_current, new_entry, new_offset);
 674
 675         return 1;
 676 }
 677
 678 _public_ int sd_journal_next(sd_journal *j) {
 679         return real_journal_next(j, DIRECTION_DOWN);
 680 }
 681
 682 _public_ int sd_journal_previous(sd_journal *j) {
 683         return real_journal_next(j, DIRECTION_UP);
 684 }
 685
 686 _public_ int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
 687         int c = 0, r;
 688
 689         if (!j)
 690                 return -EINVAL;
 691
 692         while (skip > 0) {
 693                 r = sd_journal_next(j);
 694                 if (r < 0)
 695                         return r;
 696
 697                 if (r == 0)
 698                         return c;
 699
 700                 skip--;
 701                 c++;
 702         }
 703
 704         return c;
 705 }
 706
 707 _public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
 708         int c = 0, r;
 709
 710         if (!j)
 711                 return -EINVAL;
 712
 713         while (skip > 0) {
 714                 r = sd_journal_previous(j);
 715                 if (r < 0)
 716                         return r;
 717
 718                 if (r == 0)
 719                         return c;
 720
 721                 skip--;
 722                 c++;
 723         }
 724
 725         return 1;
 726 }
 727
 728 _public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
 729         Object *o;
 730         int r;
 731         char bid[33], sid[33];
 732
 733         if (!j)
 734                 return -EINVAL;
 735         if (!cursor)
 736                 return -EINVAL;
 737
 738         if (!j->current_file || j->current_file->current_offset <= 0)
 739                 return -EADDRNOTAVAIL;
 740
 741         r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o);
 742         if (r < 0)
 743                 return r;
 744
 745         sd_id128_to_string(j->current_file->header->seqnum_id, sid);
 746         sd_id128_to_string(o->entry.boot_id, bid);
 747
 748         if (asprintf(cursor,
 749                      "s=%s;i=%llx;b=%s;m=%llx;t=%llx;x=%llx;p=%s",
 750                      sid, (unsigned long long) le64toh(o->entry.seqnum),
 751                      bid, (unsigned long long) le64toh(o->entry.monotonic),
 752                      (unsigned long long) le64toh(o->entry.realtime),
 753                      (unsigned long long) le64toh(o->entry.xor_hash),
 754                      file_name_from_path(j->current_file->path)) < 0)
 755                 return -ENOMEM;
 756
 757         return 1;
 758 }
 759
 760 _public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
 761         char *w;
 762         size_t l;
 763         char *state;
 764         unsigned long long seqnum, monotonic, realtime, xor_hash;
 765         bool
 766                 seqnum_id_set = false,
 767                 seqnum_set = false,
 768                 boot_id_set = false,
 769                 monotonic_set = false,
 770                 realtime_set = false,
 771                 xor_hash_set = false;
 772         sd_id128_t seqnum_id, boot_id;
 773
 774         if (!j)
 775                 return -EINVAL;
 776         if (!cursor)
 777                 return -EINVAL;
 778
 779         FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
 780                 char *item;
 781                 int k = 0;
 782
 783                 if (l < 2 || w[1] != '=')
 784                         return -EINVAL;
 785
 786                 item = strndup(w, l);
 787                 if (!item)
 788                         return -ENOMEM;
 789
 790                 switch (w[0]) {
 791
 792                 case 's':
 793                         seqnum_id_set = true;
 794                         k = sd_id128_from_string(w+2, &seqnum_id);
 795                         break;
 796
 797                 case 'i':
 798                         seqnum_set = true;
 799                         if (sscanf(w+2, "%llx", &seqnum) != 1)
 800                                 k = -EINVAL;
 801                         break;
 802
 803                 case 'b':
 804                         boot_id_set = true;
 805                         k = sd_id128_from_string(w+2, &boot_id);
 806                         break;
 807
 808                 case 'm':
 809                         monotonic_set = true;
 810                         if (sscanf(w+2, "%llx", &monotonic) != 1)
 811                                 k = -EINVAL;
 812                         break;
 813
 814                 case 't':
 815                         realtime_set = true;
 816                         if (sscanf(w+2, "%llx", &realtime) != 1)
 817                                 k = -EINVAL;
 818                         break;
 819
 820                 case 'x':
 821                         xor_hash_set = true;
 822                         if (sscanf(w+2, "%llx", &xor_hash) != 1)
 823                                 k = -EINVAL;
 824                         break;
 825                 }
 826
 827                 free(item);
 828
 829                 if (k < 0)
 830                         return k;
 831         }
 832
 833         if ((!seqnum_set || !seqnum_id_set) &&
 834             (!monotonic_set || !boot_id_set) &&
 835             !realtime_set)
 836                 return -EINVAL;
 837
 838         reset_location(j);
 839
 840         j->current_location.type = LOCATION_DISCRETE;
 841
 842         if (realtime_set) {
 843                 j->current_location.realtime = (uint64_t) realtime;
 844                 j->current_location.realtime_set = true;
 845         }
 846
 847         if (seqnum_set && seqnum_id_set) {
 848                 j->current_location.seqnum = (uint64_t) seqnum;
 849                 j->current_location.seqnum_id = seqnum_id;
 850                 j->current_location.seqnum_set = true;
 851         }
 852
 853         if (monotonic_set && boot_id_set) {
 854                 j->current_location.monotonic = (uint64_t) monotonic;
 855                 j->current_location.boot_id = boot_id;
 856                 j->current_location.monotonic_set = true;
 857         }
 858
 859         if (xor_hash_set) {
 860                 j->current_location.xor_hash = (uint64_t) xor_hash;
 861                 j->current_location.xor_hash_set = true;
 862         }
 863
 864         return 0;
 865 }
 866
 867 _public_ int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t usec) {
 868         if (!j)
 869                 return -EINVAL;
 870
 871         reset_location(j);
 872         j->current_location.type = LOCATION_DISCRETE;
 873         j->current_location.boot_id = boot_id;
 874         j->current_location.monotonic = usec;
 875         j->current_location.monotonic_set = true;
 876
 877         return 0;
 878 }
 879
 880 _public_ int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) {
 881         if (!j)
 882                 return -EINVAL;
 883
 884         reset_location(j);
 885         j->current_location.type = LOCATION_DISCRETE;
 886         j->current_location.realtime = usec;
 887         j->current_location.realtime_set = true;
 888
 889         return 0;
 890 }
 891
 892 _public_ int sd_journal_seek_head(sd_journal *j) {
 893         if (!j)
 894                 return -EINVAL;
 895
 896         reset_location(j);
 897         j->current_location.type = LOCATION_HEAD;
 898
 899         return 0;
 900 }
 901
 902 _public_ int sd_journal_seek_tail(sd_journal *j) {
 903         if (!j)
 904                 return -EINVAL;
 905
 906         reset_location(j);
 907         j->current_location.type = LOCATION_TAIL;
 908
 909         return 0;
 910 }
 911
 912 static int add_file(sd_journal *j, const char *prefix, const char *dir, const char *filename) {
 913         char *fn;
 914         int r;
 915         JournalFile *f;
 916
 917         assert(j);
 918         assert(prefix);
 919         assert(filename);
 920
 921         if ((j->flags & SD_JOURNAL_SYSTEM_ONLY) &&
 922             !startswith(filename, "system.journal"))
 923                 return 0;
 924
 925         if (dir)
 926                 fn = join(prefix, "/", dir, "/", filename, NULL);
 927         else
 928                 fn = join(prefix, "/", filename, NULL);
 929
 930         if (!fn)
 931                 return -ENOMEM;
 932
 933         if (hashmap_get(j->files, fn)) {
 934                 free(fn);
 935                 return 0;
 936         }
 937
 938         if (hashmap_size(j->files) >= JOURNAL_FILES_MAX) {
 939                 log_debug("Too many open journal files, not adding %s, ignoring.", fn);
 940                 free(fn);
 941                 return 0;
 942         }
 943
 944         r = journal_file_open(fn, O_RDONLY, 0, NULL, &f);
 945         free(fn);
 946
 947         if (r < 0) {
 948                 if (errno == ENOENT)
 949                         return 0;
 950
 951                 return r;
 952         }
 953
 954         /* journal_file_dump(f); */
 955
 956         r = hashmap_put(j->files, f->path, f);
 957         if (r < 0) {
 958                 journal_file_close(f);
 959                 return r;
 960         }
 961
 962         log_debug("File %s got added.", f->path);
 963
 964         return 0;
 965 }
 966
 967 static int remove_file(sd_journal *j, const char *prefix, const char *dir, const char *filename) {
 968         char *fn;
 969         JournalFile *f;
 970
 971         assert(j);
 972         assert(prefix);
 973         assert(filename);
 974
 975         if (dir)
 976                 fn = join(prefix, "/", dir, "/", filename, NULL);
 977         else
 978                 fn = join(prefix, "/", filename, NULL);
 979
 980         if (!fn)
 981                 return -ENOMEM;
 982
 983         f = hashmap_get(j->files, fn);
 984         free(fn);
 985
 986         if (!f)
 987                 return 0;
 988
 989         hashmap_remove(j->files, f->path);
 990         journal_file_close(f);
 991
 992         log_debug("File %s got removed.", f->path);
 993         return 0;
 994 }
 995
 996 static int add_directory(sd_journal *j, const char *prefix, const char *dir) {
 997         char *fn;
 998         int r;
 999         DIR *d;
1000         int wd;
1001         sd_id128_t id, mid;
1002
1003         assert(j);
1004         assert(prefix);
1005         assert(dir);
1006
1007         if ((j->flags & SD_JOURNAL_LOCAL_ONLY) &&
1008             (sd_id128_from_string(dir, &id) < 0 ||
1009              sd_id128_get_machine(&mid) < 0 ||
1010              !sd_id128_equal(id, mid)))
1011             return 0;
1012
1013         fn = join(prefix, "/", dir, NULL);
1014         if (!fn)
1015                 return -ENOMEM;
1016
1017         d = opendir(fn);
1018
1019         if (!d) {
1020                 free(fn);
1021                 if (errno == ENOENT)
1022                         return 0;
1023
1024                 return -errno;
1025         }
1026
1027         wd = inotify_add_watch(j->inotify_fd, fn,
1028                                IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
1029                                IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|
1030                                IN_DONT_FOLLOW|IN_ONLYDIR);
1031         if (wd > 0) {
1032                 if (hashmap_put(j->inotify_wd_dirs, INT_TO_PTR(wd), fn) < 0)
1033                         inotify_rm_watch(j->inotify_fd, wd);
1034                 else
1035                         fn = NULL;
1036         }
1037
1038         free(fn);
1039
1040         for (;;) {
1041                 struct dirent buf, *de;
1042
1043                 r = readdir_r(d, &buf, &de);
1044                 if (r != 0 || !de)
1045                         break;
1046
1047                 if (!dirent_is_file_with_suffix(de, ".journal"))
1048                         continue;
1049
1050                 r = add_file(j, prefix, dir, de->d_name);
1051                 if (r < 0)
1052                         log_debug("Failed to add file %s/%s/%s: %s", prefix, dir, de->d_name, strerror(-r));
1053         }
1054
1055         closedir(d);
1056
1057         log_debug("Directory %s/%s got added.", prefix, dir);
1058
1059         return 0;
1060 }
1061
1062 static void remove_directory_wd(sd_journal *j, int wd) {
1063         char *p;
1064
1065         assert(j);
1066         assert(wd > 0);
1067
1068         if (j->inotify_fd >= 0)
1069                 inotify_rm_watch(j->inotify_fd, wd);
1070
1071         p = hashmap_remove(j->inotify_wd_dirs, INT_TO_PTR(wd));
1072
1073         if (p) {
1074                 log_debug("Directory %s got removed.", p);
1075                 free(p);
1076         }
1077 }
1078
1079 static void add_root_wd(sd_journal *j, const char *p) {
1080         int wd;
1081         char *k;
1082
1083         assert(j);
1084         assert(p);
1085
1086         wd = inotify_add_watch(j->inotify_fd, p,
1087                                IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE|
1088                                IN_DONT_FOLLOW|IN_ONLYDIR);
1089         if (wd <= 0)
1090                 return;
1091
1092         k = strdup(p);
1093         if (!k || hashmap_put(j->inotify_wd_roots, INT_TO_PTR(wd), k) < 0) {
1094                 inotify_rm_watch(j->inotify_fd, wd);
1095                 free(k);
1096         }
1097 }
1098
1099 static void remove_root_wd(sd_journal *j, int wd) {
1100         char *p;
1101
1102         assert(j);
1103         assert(wd > 0);
1104
1105         if (j->inotify_fd >= 0)
1106                 inotify_rm_watch(j->inotify_fd, wd);
1107
1108         p = hashmap_remove(j->inotify_wd_roots, INT_TO_PTR(wd));
1109
1110         if (p) {
1111                 log_debug("Root %s got removed.", p);
1112                 free(p);
1113         }
1114 }
1115
1116 _public_ int sd_journal_open(sd_journal **ret, int flags) {
1117         sd_journal *j;
1118         const char *p;
1119         const char search_paths[] =
1120                 "/run/log/journal\0"
1121                 "/var/log/journal\0";
1122         int r;
1123
1124         if (!ret)
1125                 return -EINVAL;
1126
1127         if (flags & ~(SD_JOURNAL_LOCAL_ONLY|
1128                       SD_JOURNAL_RUNTIME_ONLY|
1129                       SD_JOURNAL_SYSTEM_ONLY))
1130                 return -EINVAL;
1131
1132         j = new0(sd_journal, 1);
1133         if (!j)
1134                 return -ENOMEM;
1135
1136         j->flags = flags;
1137
1138         j->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
1139         if (j->inotify_fd < 0) {
1140                 r = -errno;
1141                 goto fail;
1142         }
1143
1144         j->files = hashmap_new(string_hash_func, string_compare_func);
1145         if (!j->files) {
1146                 r = -ENOMEM;
1147                 goto fail;
1148         }
1149
1150         j->inotify_wd_dirs = hashmap_new(trivial_hash_func, trivial_compare_func);
1151         j->inotify_wd_roots = hashmap_new(trivial_hash_func, trivial_compare_func);
1152
1153         if (!j->inotify_wd_dirs || !j->inotify_wd_roots) {
1154                 r = -ENOMEM;
1155                 goto fail;
1156         }
1157
1158         /* We ignore most errors here, since the idea is to only open
1159          * what's actually accessible, and ignore the rest. */
1160
1161         NULSTR_FOREACH(p, search_paths) {
1162                 DIR *d;
1163
1164                 if ((flags & SD_JOURNAL_RUNTIME_ONLY) &&
1165                     !path_startswith(p, "/run"))
1166                         continue;
1167
1168                 d = opendir(p);
1169                 if (!d) {
1170                         if (errno != ENOENT)
1171                                 log_debug("Failed to open %s: %m", p);
1172                         continue;
1173                 }
1174
1175                 add_root_wd(j, p);
1176
1177                 for (;;) {
1178                         struct dirent buf, *de;
1179                         sd_id128_t id;
1180
1181                         r = readdir_r(d, &buf, &de);
1182                         if (r != 0 || !de)
1183                                 break;
1184
1185                         if (dirent_is_file_with_suffix(de, ".journal")) {
1186                                 r = add_file(j, p, NULL, de->d_name);
1187                                 if (r < 0)
1188                                         log_debug("Failed to add file %s/%s: %s", p, de->d_name, strerror(-r));
1189
1190                         } else if ((de->d_type == DT_DIR || de->d_type == DT_UNKNOWN) &&
1191                                    sd_id128_from_string(de->d_name, &id) >= 0) {
1192
1193                                 r = add_directory(j, p, de->d_name);
1194                                 if (r < 0)
1195                                         log_debug("Failed to add directory %s/%s: %s", p, de->d_name, strerror(-r));
1196                         }
1197                 }
1198
1199                 closedir(d);
1200         }
1201
1202         *ret = j;
1203         return 0;
1204
1205 fail:
1206         sd_journal_close(j);
1207
1208         return r;
1209 };
1210
1211 _public_ void sd_journal_close(sd_journal *j) {
1212         if (!j)
1213                 return;
1214
1215         if (j->inotify_wd_dirs) {
1216                 void *k;
1217
1218                 while ((k = hashmap_first_key(j->inotify_wd_dirs)))
1219                         remove_directory_wd(j, PTR_TO_INT(k));
1220
1221                 hashmap_free(j->inotify_wd_dirs);
1222         }
1223
1224         if (j->inotify_wd_roots) {
1225                 void *k;
1226
1227                 while ((k = hashmap_first_key(j->inotify_wd_roots)))
1228                         remove_root_wd(j, PTR_TO_INT(k));
1229
1230                 hashmap_free(j->inotify_wd_roots);
1231         }
1232
1233         if (j->files) {
1234                 JournalFile *f;
1235
1236                 while ((f = hashmap_steal_first(j->files)))
1237                         journal_file_close(f);
1238
1239                 hashmap_free(j->files);
1240         }
1241
1242         sd_journal_flush_matches(j);
1243
1244         if (j->inotify_fd >= 0)
1245                 close_nointr_nofail(j->inotify_fd);
1246
1247         free(j);
1248 }
1249
1250 _public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
1251         Object *o;
1252         JournalFile *f;
1253         int r;
1254
1255         if (!j)
1256                 return -EINVAL;
1257         if (!ret)
1258                 return -EINVAL;
1259
1260         f = j->current_file;
1261         if (!f)
1262                 return -EADDRNOTAVAIL;
1263
1264         if (f->current_offset <= 0)
1265                 return -EADDRNOTAVAIL;
1266
1267         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1268         if (r < 0)
1269                 return r;
1270
1271         *ret = le64toh(o->entry.realtime);
1272         return 0;
1273 }
1274
1275 _public_ int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_boot_id) {
1276         Object *o;
1277         JournalFile *f;
1278         int r;
1279         sd_id128_t id;
1280
1281         if (!j)
1282                 return -EINVAL;
1283         if (!ret)
1284                 return -EINVAL;
1285
1286         f = j->current_file;
1287         if (!f)
1288                 return -EADDRNOTAVAIL;
1289
1290         if (f->current_offset <= 0)
1291                 return -EADDRNOTAVAIL;
1292
1293         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1294         if (r < 0)
1295                 return r;
1296
1297         if (ret_boot_id)
1298                 *ret_boot_id = o->entry.boot_id;
1299         else {
1300                 r = sd_id128_get_boot(&id);
1301                 if (r < 0)
1302                         return r;
1303
1304                 if (!sd_id128_equal(id, o->entry.boot_id))
1305                         return -ENOENT;
1306         }
1307
1308         *ret = le64toh(o->entry.monotonic);
1309         return 0;
1310 }
1311
1312 _public_ int sd_journal_get_data(sd_journal *j, const char *field, const void **data, size_t *size) {
1313         JournalFile *f;
1314         uint64_t i, n;
1315         size_t field_length;
1316         int r;
1317         Object *o;
1318
1319         if (!j)
1320                 return -EINVAL;
1321         if (!field)
1322                 return -EINVAL;
1323         if (!data)
1324                 return -EINVAL;
1325         if (!size)
1326                 return -EINVAL;
1327
1328         if (isempty(field) || strchr(field, '='))
1329                 return -EINVAL;
1330
1331         f = j->current_file;
1332         if (!f)
1333                 return -EADDRNOTAVAIL;
1334
1335         if (f->current_offset <= 0)
1336                 return -EADDRNOTAVAIL;
1337
1338         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1339         if (r < 0)
1340                 return r;
1341
1342         field_length = strlen(field);
1343
1344         n = journal_file_entry_n_items(o);
1345         for (i = 0; i < n; i++) {
1346                 uint64_t p, l, le_hash;
1347                 size_t t;
1348
1349                 p = le64toh(o->entry.items[i].object_offset);
1350                 le_hash = o->entry.items[i].hash;
1351                 r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
1352                 if (r < 0)
1353                         return r;
1354
1355                 if (le_hash != o->data.hash)
1356                         return -EBADMSG;
1357
1358                 l = le64toh(o->object.size) - offsetof(Object, data.payload);
1359
1360                 if (o->object.flags & OBJECT_COMPRESSED) {
1361
1362 #ifdef HAVE_XZ
1363                         if (uncompress_startswith(o->data.payload, l,
1364                                                   &f->compress_buffer, &f->compress_buffer_size,
1365                                                   field, field_length, '=')) {
1366
1367                                 uint64_t rsize;
1368
1369                                 if (!uncompress_blob(o->data.payload, l,
1370                                                      &f->compress_buffer, &f->compress_buffer_size, &rsize))
1371                                         return -EBADMSG;
1372
1373                                 *data = f->compress_buffer;
1374                                 *size = (size_t) rsize;
1375
1376                                 return 0;
1377                         }
1378 #else
1379                         return -EPROTONOSUPPORT;
1380 #endif
1381
1382                 } else if (l >= field_length+1 &&
1383                            memcmp(o->data.payload, field, field_length) == 0 &&
1384                            o->data.payload[field_length] == '=') {
1385
1386                         t = (size_t) l;
1387
1388                         if ((uint64_t) t != l)
1389                                 return -E2BIG;
1390
1391                         *data = o->data.payload;
1392                         *size = t;
1393
1394                         return 0;
1395                 }
1396
1397                 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1398                 if (r < 0)
1399                         return r;
1400         }
1401
1402         return -ENOENT;
1403 }
1404
1405 _public_ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
1406         JournalFile *f;
1407         uint64_t p, l, n, le_hash;
1408         int r;
1409         Object *o;
1410         size_t t;
1411
1412         if (!j)
1413                 return -EINVAL;
1414         if (!data)
1415                 return -EINVAL;
1416         if (!size)
1417                 return -EINVAL;
1418
1419         f = j->current_file;
1420         if (!f)
1421                 return -EADDRNOTAVAIL;
1422
1423         if (f->current_offset <= 0)
1424                 return -EADDRNOTAVAIL;
1425
1426         r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1427         if (r < 0)
1428                 return r;
1429
1430         n = journal_file_entry_n_items(o);
1431         if (j->current_field >= n)
1432                 return 0;
1433
1434         p = le64toh(o->entry.items[j->current_field].object_offset);
1435         le_hash = o->entry.items[j->current_field].hash;
1436         r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
1437         if (r < 0)
1438                 return r;
1439
1440         if (le_hash != o->data.hash)
1441                 return -EBADMSG;
1442
1443         l = le64toh(o->object.size) - offsetof(Object, data.payload);
1444         t = (size_t) l;
1445
1446         /* We can't read objects larger than 4G on a 32bit machine */
1447         if ((uint64_t) t != l)
1448                 return -E2BIG;
1449
1450         if (o->object.flags & OBJECT_COMPRESSED) {
1451 #ifdef HAVE_XZ
1452                 uint64_t rsize;
1453
1454                 if (!uncompress_blob(o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, &rsize))
1455                         return -EBADMSG;
1456
1457                 *data = f->compress_buffer;
1458                 *size = (size_t) rsize;
1459 #else
1460                 return -EPROTONOSUPPORT;
1461 #endif
1462         } else {
1463                 *data = o->data.payload;
1464                 *size = t;
1465         }
1466
1467         j->current_field ++;
1468
1469         return 1;
1470 }
1471
1472 _public_ void sd_journal_restart_data(sd_journal *j) {
1473         if (!j)
1474                 return;
1475
1476         j->current_field = 0;
1477 }
1478
1479 _public_ int sd_journal_get_fd(sd_journal *j) {
1480         if (!j)
1481                 return -EINVAL;
1482
1483         return j->inotify_fd;
1484 }
1485
1486 static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
1487         char *p;
1488         int r;
1489
1490         assert(j);
1491         assert(e);
1492
1493         /* Is this a subdirectory we watch? */
1494         p = hashmap_get(j->inotify_wd_dirs, INT_TO_PTR(e->wd));
1495         if (p) {
1496
1497                 if (!(e->mask & IN_ISDIR) && e->len > 0 && endswith(e->name, ".journal")) {
1498
1499                         /* Event for a journal file */
1500
1501                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
1502                                 r = add_file(j, p, NULL, e->name);
1503                                 if (r < 0)
1504                                         log_debug("Failed to add file %s/%s: %s", p, e->name, strerror(-r));
1505                         } else if (e->mask & (IN_DELETE|IN_UNMOUNT)) {
1506
1507                                 r = remove_file(j, p, NULL, e->name);
1508                                 if (r < 0)
1509                                         log_debug("Failed to remove file %s/%s: %s", p, e->name, strerror(-r));
1510                         }
1511
1512                 } else if (e->len == 0) {
1513
1514                         /* Event for the directory itself */
1515
1516                         if (e->mask & (IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT))
1517                                 remove_directory_wd(j, e->wd);
1518                 }
1519
1520                 return;
1521         }
1522
1523         /* Must be the root directory then? */
1524         p = hashmap_get(j->inotify_wd_roots, INT_TO_PTR(e->wd));
1525         if (p) {
1526                 sd_id128_t id;
1527
1528                 if (!(e->mask & IN_ISDIR) && e->len > 0 && endswith(e->name, ".journal")) {
1529
1530                         /* Event for a journal file */
1531
1532                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
1533                                 r = add_file(j, p, NULL, e->name);
1534                                 if (r < 0)
1535                                         log_debug("Failed to add file %s/%s: %s", p, e->name, strerror(-r));
1536                         } else if (e->mask & (IN_DELETE|IN_UNMOUNT)) {
1537
1538                                 r = remove_file(j, p, NULL, e->name);
1539                                 if (r < 0)
1540                                         log_debug("Failed to remove file %s/%s: %s", p, e->name, strerror(-r));
1541                         }
1542
1543                 } else if ((e->mask & IN_ISDIR) && e->len > 0 && sd_id128_from_string(e->name, &id) >= 0) {
1544
1545                         /* Event for subdirectory */
1546
1547                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
1548
1549                                 r = add_directory(j, p, e->name);
1550                                 if (r < 0)
1551                                         log_debug("Failed to add directory %s/%s: %s", p, e->name, strerror(-r));
1552                         }
1553                 }
1554
1555                 return;
1556         }
1557
1558         if (e->mask & IN_IGNORED)
1559                 return;
1560
1561         log_warning("Unknown inotify event.");
1562 }
1563
1564 _public_ int sd_journal_process(sd_journal *j) {
1565         uint8_t buffer[sizeof(struct inotify_event) + FILENAME_MAX];
1566
1567         if (!j)
1568                 return -EINVAL;
1569
1570         for (;;) {
1571                 struct inotify_event *e;
1572                 ssize_t l;
1573
1574                 l = read(j->inotify_fd, buffer, sizeof(buffer));
1575                 if (l < 0) {
1576                         if (errno == EINTR || errno == EAGAIN)
1577                                 return 0;
1578
1579                         return -errno;
1580                 }
1581
1582                 e = (struct inotify_event*) buffer;
1583                 while (l > 0) {
1584                         size_t step;
1585
1586                         process_inotify_event(j, e);
1587
1588                         step = sizeof(struct inotify_event) + e->len;
1589                         assert(step <= (size_t) l);
1590
1591                         e = (struct inotify_event*) ((uint8_t*) e + step);
1592                         l -= step;
1593                 }
1594         }
1595 }
1596
1597 _public_ int sd_journal_query_unique(sd_journal *j, const char *field) {
1598         if (!j)
1599                 return -EINVAL;
1600         if (!field)
1601                 return -EINVAL;
1602
1603         return -ENOTSUP;
1604 }
1605
1606 _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) {
1607         if (!j)
1608                 return -EINVAL;
1609         if (!data)
1610                 return -EINVAL;
1611         if (!l)
1612                 return -EINVAL;
1613
1614         return -ENOTSUP;
1615 }
1616
1617 _public_ void sd_journal_restart_unique(sd_journal *j) {
1618         if (!j)
1619                 return;
1620 }