summaryrefslogtreecommitdiff
path: root/src/journal/coredumpctl.c
blob: 6628e82421c6174e37538aeac60031f598c17a0e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2012 Zbigniew Jędrzejewski-Szmek

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <locale.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
#include <unistd.h>

#include "sd-journal.h"
#include "build.h"
#include "set.h"
#include "util.h"
#include "log.h"
#include "path-util.h"
#include "pager.h"
#include "macro.h"
#include "journal-internal.h"
#include "compress.h"
#include "sigbus.h"
#include "process-util.h"
#include "terminal-util.h"
#include "signal-util.h"

static enum {
        ACTION_NONE,
        ACTION_INFO,
        ACTION_LIST,
        ACTION_DUMP,
        ACTION_GDB,
} arg_action = ACTION_LIST;
static const char* arg_field = NULL;
static const char *arg_directory = NULL;
static int arg_no_pager = false;
static int arg_no_legend = false;
static int arg_one = false;
static FILE* arg_output = NULL;

static Set *new_matches(void) {
        Set *set;
        char *tmp;
        int r;

        set = set_new(NULL);
        if (!set) {
                log_oom();
                return NULL;
        }

        tmp = strdup("MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
        if (!tmp) {
                log_oom();
                set_free(set);
                return NULL;
        }

        r = set_consume(set, tmp);
        if (r < 0) {
                log_error_errno(r, "failed to add to set: %m");
                set_free(set);
                return NULL;
        }

        return set;
}

static int add_match(Set *set, const char *match) {
        int r = -ENOMEM;
        unsigned pid;
        const char* prefix;
        char *pattern = NULL;
        _cleanup_free_ char *p = NULL;

        if (strchr(match, '='))
                prefix = "";
        else if (strchr(match, '/')) {
                p = path_make_absolute_cwd(match);
                if (!p)
                        goto fail;

                match = p;
                prefix = "COREDUMP_EXE=";
        }
        else if (safe_atou(match, &pid) == 0)
                prefix = "COREDUMP_PID=";
        else
                prefix = "COREDUMP_COMM=";

        pattern = strjoin(prefix, match, NULL);
        if (!pattern)
                goto fail;

        log_debug("Adding pattern: %s", pattern);
        r = set_consume(set, pattern);
        if (r < 0) {
                log_error_errno(r, "Failed to add pattern: %m");
                goto fail;
        }

        return 0;
fail:
        return log_error_errno(r, "Failed to add match: %m");
}

static void help(void) {
        printf("%s [OPTIONS...]\n\n"
               "List or retrieve coredumps from the journal.\n\n"
               "Flags:\n"
               "  -h --help          Show this help\n"
               "     --version       Print version string\n"
               "     --no-pager      Do not pipe output into a pager\n"
               "     --no-legend     Do not print the column headers.\n"
               "  -1                 Show information about most recent entry only\n"
               "  -F --field=FIELD   List all values a certain field takes\n"
               "  -o --output=FILE   Write output to FILE\n\n"
               "  -D --directory=DIR Use journal files from directory\n\n"

               "Commands:\n"
               "  list [MATCHES...]  List available coredumps (default)\n"
               "  info [MATCHES...]  Show detailed information about one or more coredumps\n"
               "  dump [MATCHES...]  Print first matching coredump to stdout\n"
               "  gdb [MATCHES...]   Start gdb for the first matching coredump\n"
               , program_invocation_short_name);
}

static int parse_argv(int argc, char *argv[], Set *matches) {
        enum {
                ARG_VERSION = 0x100,
                ARG_NO_PAGER,
                ARG_NO_LEGEND,
        };

        int r, c;

        static const struct option options[] = {
                { "help",         no_argument,       NULL, 'h'           },
                { "version" ,     no_argument,       NULL, ARG_VERSION   },
                { "no-pager",     no_argument,       NULL, ARG_NO_PAGER  },
                { "no-legend",    no_argument,       NULL, ARG_NO_LEGEND },
                { "output",       required_argument, NULL, 'o'           },
                { "field",        required_argument, NULL, 'F'           },
                { "directory",    required_argument, NULL, 'D'           },
                {}
        };

        assert(argc >= 0);
        assert(argv);

        while ((c = getopt_long(argc, argv, "ho:F:1D:", options, NULL)) >= 0)
                switch(c) {

                case 'h':
                        arg_action = ACTION_NONE;
                        help();
                        return 0;

                case ARG_VERSION:
                        arg_action = ACTION_NONE;
                        puts(PACKAGE_STRING);
                        puts(SYSTEMD_FEATURES);
                        return 0;

                case ARG_NO_PAGER:
                        arg_no_pager = true;
                        break;

                case ARG_NO_LEGEND:
                        arg_no_legend = true;
                        break;

                case 'o':
                        if (arg_output) {
                                log_error("cannot set output more than once");
                                return -EINVAL;
                        }

                        arg_output = fopen(optarg, "we");
                        if (!arg_output)
                                return log_error_errno(errno, "writing to '%s': %m", optarg);

                        break;

                case 'F':
                        if (arg_field) {
                                log_error("cannot use --field/-F more than once");
                                return -EINVAL;
                        }
                        arg_field = optarg;
                        break;

                case '1':
                        arg_one = true;
                        break;

                case 'D':
                        arg_directory = optarg;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        assert_not_reached("Unhandled option");
                }

        if (optind < argc) {
                const char *cmd = argv[optind++];
                if (streq(cmd, "list"))
                        arg_action = ACTION_LIST;
                else if (streq(cmd, "dump"))
                        arg_action = ACTION_DUMP;
                else if (streq(cmd, "gdb"))
                        arg_action = ACTION_GDB;
                else if (streq(cmd, "info"))
                        arg_action = ACTION_INFO;
                else {
                        log_error("Unknown action '%s'", cmd);
                        return -EINVAL;
                }
        }

        if (arg_field && arg_action != ACTION_LIST) {
                log_error("Option --field/-F only makes sense with list");
                return -EINVAL;
        }

        while (optind < argc) {
                r = add_match(matches, argv[optind]);
                if (r != 0)
                        return r;
                optind++;
        }

        return 0;
}

static int retrieve(const void *data,
                    size_t len,
                    const char *name,
                    char **var) {

        size_t ident;
        char *v;

        ident = strlen(name) + 1; /* name + "=" */

        if (len < ident)
                return 0;

        if (memcmp(data, name, ident - 1) != 0)
                return 0;

        if (((const char*) data)[ident - 1] != '=')
                return 0;

        v = strndup((const char*)data + ident, len - ident);
        if (!v)
                return log_oom();

        free(*var);
        *var = v;

        return 0;
}

static void print_field(FILE* file, sd_journal *j) {
        _cleanup_free_ char *value = NULL;
        const void *d;
        size_t l;

        assert(file);
        assert(j);

        assert(arg_field);

        SD_JOURNAL_FOREACH_DATA(j, d, l)
                retrieve(d, l, arg_field, &value);

        if (value)
                fprintf(file, "%s\n", value);
}

static int print_list(FILE* file, sd_journal *j, int had_legend) {
        _cleanup_free_ char
                *pid = NULL, *uid = NULL, *gid = NULL,
                *sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
                *filename = NULL;
        const void *d;
        size_t l;
        usec_t t;
        char buf[FORMAT_TIMESTAMP_MAX];
        int r;
        bool present;

        assert(file);
        assert(j);

        SD_JOURNAL_FOREACH_DATA(j, d, l) {
                retrieve(d, l, "COREDUMP_PID", &pid);
                retrieve(d, l, "COREDUMP_UID", &uid);
                retrieve(d, l, "COREDUMP_GID", &gid);
                retrieve(d, l, "COREDUMP_SIGNAL", &sgnl);
                retrieve(d, l, "COREDUMP_EXE", &exe);
                retrieve(d, l, "COREDUMP_COMM", &comm);
                retrieve(d, l, "COREDUMP_CMDLINE", &cmdline);
                retrieve(d, l, "COREDUMP_FILENAME", &filename);
        }

        if (!pid && !uid && !gid && !sgnl && !exe && !comm && !cmdline && !filename) {
                log_warning("Empty coredump log entry");
                return -EINVAL;
        }

        r = sd_journal_get_realtime_usec(j, &t);
        if (r < 0)
                return log_error_errno(r, "Failed to get realtime timestamp: %m");

        format_timestamp(buf, sizeof(buf), t);
        present = filename && access(filename, F_OK) == 0;

        if (!had_legend && !arg_no_legend)
                fprintf(file, "%-*s %*s %*s %*s %*s %*s %s\n",
                        FORMAT_TIMESTAMP_WIDTH, "TIME",
                        6, "PID",
                        5, "UID",
                        5, "GID",
                        3, "SIG",
                        1, "PRESENT",
                           "EXE");

        fprintf(file, "%-*s %*s %*s %*s %*s %*s %s\n",
                FORMAT_TIMESTAMP_WIDTH, buf,
                6, strna(pid),
                5, strna(uid),
                5, strna(gid),
                3, strna(sgnl),
                1, present ? "*" : "",
                strna(exe ?: (comm ?: cmdline)));

        return 0;
}

static int print_info(FILE *file, sd_journal *j, bool need_space) {
        _cleanup_free_ char
                *pid = NULL, *uid = NULL, *gid = NULL,
                *sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
                *unit = NULL, *user_unit = NULL, *session = NULL,
                *boot_id = NULL, *machine_id = NULL, *hostname = NULL,
                *slice = NULL, *cgroup = NULL, *owner_uid = NULL,
                *message = NULL, *timestamp = NULL, *filename = NULL;
        const void *d;
        size_t l;
        int r;

        assert(file);
        assert(j);

        SD_JOURNAL_FOREACH_DATA(j, d, l) {
                retrieve(d, l, "COREDUMP_PID", &pid);
                retrieve(d, l, "COREDUMP_UID", &uid);
                retrieve(d, l, "COREDUMP_GID", &gid);
                retrieve(d, l, "COREDUMP_SIGNAL", &sgnl);
                retrieve(d, l, "COREDUMP_EXE", &exe);
                retrieve(d, l, "COREDUMP_COMM", &comm);
                retrieve(d, l, "COREDUMP_CMDLINE", &cmdline);
                retrieve(d, l, "COREDUMP_UNIT", &unit);
                retrieve(d, l, "COREDUMP_USER_UNIT", &user_unit);
                retrieve(d, l, "COREDUMP_SESSION", &session);
                retrieve(d, l, "COREDUMP_OWNER_UID", &owner_uid);
                retrieve(d, l, "COREDUMP_SLICE", &slice);
                retrieve(d, l, "COREDUMP_CGROUP", &cgroup);
                retrieve(d, l, "COREDUMP_TIMESTAMP", &timestamp);
                retrieve(d, l, "COREDUMP_FILENAME", &filename);
                retrieve(d, l, "_BOOT_ID", &boot_id);
                retrieve(d, l, "_MACHINE_ID", &machine_id);
                retrieve(d, l, "_HOSTNAME", &hostname);
                retrieve(d, l, "MESSAGE", &message);
        }

        if (need_space)
                fputs("\n", file);

        if (comm)
                fprintf(file,
                        "           PID: %s%s%s (%s)\n",
                        ansi_highlight(), strna(pid), ansi_normal(), comm);
        else
                fprintf(file,
                        "           PID: %s%s%s\n",
                        ansi_highlight(), strna(pid), ansi_normal());

        if (uid) {
                uid_t n;

                if (parse_uid(uid, &n) >= 0) {
                        _cleanup_free_ char *u = NULL;

                        u = uid_to_name(n);
                        fprintf(file,
                                "           UID: %s (%s)\n",
                                uid, u);
                } else {
                        fprintf(file,
                                "           UID: %s\n",
                                uid);
                }
        }

        if (gid) {
                gid_t n;

                if (parse_gid(gid, &n) >= 0) {
                        _cleanup_free_ char *g = NULL;

                        g = gid_to_name(n);
                        fprintf(file,
                                "           GID: %s (%s)\n",
                                gid, g);
                } else {
                        fprintf(file,
                                "           GID: %s\n",
                                gid);
                }
        }

        if (sgnl) {
                int sig;

                if (safe_atoi(sgnl, &sig) >= 0)
                        fprintf(file, "        Signal: %s (%s)\n", sgnl, signal_to_string(sig));
                else
                        fprintf(file, "        Signal: %s\n", sgnl);
        }

        if (timestamp) {
                usec_t u;

                r = safe_atou64(timestamp, &u);
                if (r >= 0) {
                        char absolute[FORMAT_TIMESTAMP_MAX], relative[FORMAT_TIMESPAN_MAX];

                        fprintf(file,
                                "     Timestamp: %s (%s)\n",
                                format_timestamp(absolute, sizeof(absolute), u),
                                format_timestamp_relative(relative, sizeof(relative), u));

                } else
                        fprintf(file, "     Timestamp: %s\n", timestamp);
        }

        if (cmdline)
                fprintf(file, "  Command Line: %s\n", cmdline);
        if (exe)
                fprintf(file, "    Executable: %s%s%s\n", ansi_highlight(), exe, ansi_normal());
        if (cgroup)
                fprintf(file, " Control Group: %s\n", cgroup);
        if (unit)
                fprintf(file, "          Unit: %s\n", unit);
        if (user_unit)
                fprintf(file, "     User Unit: %s\n", unit);
        if (slice)
                fprintf(file, "         Slice: %s\n", slice);
        if (session)
                fprintf(file, "       Session: %s\n", session);
        if (owner_uid) {
                uid_t n;

                if (parse_uid(owner_uid, &n) >= 0) {
                        _cleanup_free_ char *u = NULL;

                        u = uid_to_name(n);
                        fprintf(file,
                                "     Owner UID: %s (%s)\n",
                                owner_uid, u);
                } else {
                        fprintf(file,
                                "     Owner UID: %s\n",
                                owner_uid);
                }
        }
        if (boot_id)
                fprintf(file, "       Boot ID: %s\n", boot_id);
        if (machine_id)
                fprintf(file, "    Machine ID: %s\n", machine_id);
        if (hostname)
                fprintf(file, "      Hostname: %s\n", hostname);

        if (filename && access(filename, F_OK) == 0)
                fprintf(file, "      Coredump: %s\n", filename);

        if (message) {
                _cleanup_free_ char *m = NULL;

                m = strreplace(message, "\n", "\n                ");

                fprintf(file, "       Message: %s\n", strstrip(m ?: message));
        }

        return 0;
}

static int focus(sd_journal *j) {
        int r;

        r = sd_journal_seek_tail(j);
        if (r == 0)
                r = sd_journal_previous(j);
        if (r < 0)
                return log_error_errno(r, "Failed to search journal: %m");
        if (r == 0) {
                log_error("No match found.");
                return -ESRCH;
        }
        return r;
}

static void print_entry(sd_journal *j, unsigned n_found) {
        assert(j);

        if (arg_action == ACTION_INFO)
                print_info(stdout, j, n_found);
        else if (arg_field)
                print_field(stdout, j);
        else
                print_list(stdout, j, n_found);
}

static int dump_list(sd_journal *j) {
        unsigned n_found = 0;
        int r;

        assert(j);

        /* The coredumps are likely to compressed, and for just
         * listing them we don't need to decompress them, so let's
         * pick a fairly low data threshold here */
        sd_journal_set_data_threshold(j, 4096);

        if (arg_one) {
                r = focus(j);
                if (r < 0)
                        return r;

                print_entry(j, 0);
        } else {
                SD_JOURNAL_FOREACH(j)
                        print_entry(j, n_found++);

                if (!arg_field && n_found <= 0) {
                        log_notice("No coredumps found.");
                        return -ESRCH;
                }
        }

        return 0;
}

static int save_core(sd_journal *j, int fd, char **path, bool *unlink_temp) {
        const char *data;
        _cleanup_free_ char *filename = NULL;
        size_t len;
        int r;

        assert((fd >= 0) != !!path);
        assert(!!path == !!unlink_temp);

        /* Prefer uncompressed file to journal (probably cached) to
         * compressed file (probably uncached). */
        r = sd_journal_get_data(j, "COREDUMP_FILENAME", (const void**) &data, &len);
        if (r < 0 && r != -ENOENT)
                log_warning_errno(r, "Failed to retrieve COREDUMP_FILENAME: %m");
        else if (r == 0)
                retrieve(data, len, "COREDUMP_FILENAME", &filename);

        if (filename && access(filename, R_OK) < 0) {
                log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
                         "File %s is not readable: %m", filename);
                filename = mfree(filename);
        }

        if (filename && !endswith(filename, ".xz") && !endswith(filename, ".lz4")) {
                if (path) {
                        *path = filename;
                        filename = NULL;
                }

                return 0;
        } else {
                _cleanup_close_ int fdt = -1;
                char *temp = NULL;

                if (fd < 0) {
                        temp = strdup("/var/tmp/coredump-XXXXXX");
                        if (!temp)
                                return log_oom();

                        fdt = mkostemp_safe(temp, O_WRONLY|O_CLOEXEC);
                        if (fdt < 0)
                                return log_error_errno(errno, "Failed to create temporary file: %m");
                        log_debug("Created temporary file %s", temp);

                        fd = fdt;
                }

                r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
                if (r == 0) {
                        ssize_t sz;

                        assert(len >= 9);
                        data += 9;
                        len -= 9;

                        sz = write(fdt, data, len);
                        if (sz < 0) {
                                r = log_error_errno(errno,
                                                    "Failed to write temporary file: %m");
                                goto error;
                        }
                        if (sz != (ssize_t) len) {
                                log_error("Short write to temporary file.");
                                r = -EIO;
                                goto error;
                        }
                } else if (filename) {
#if defined(HAVE_XZ) || defined(HAVE_LZ4)
                        _cleanup_close_ int fdf;

                        fdf = open(filename, O_RDONLY | O_CLOEXEC);
                        if (fdf < 0) {
                                r = log_error_errno(errno,
                                                    "Failed to open %s: %m",
                                                    filename);
                                goto error;
                        }

                        r = decompress_stream(filename, fdf, fd, -1);
                        if (r < 0) {
                                log_error_errno(r, "Failed to decompress %s: %m", filename);
                                goto error;
                        }
#else
                        log_error("Cannot decompress file. Compiled without compression support.");
                        r = -EOPNOTSUPP;
                        goto error;
#endif
                } else {
                        if (r == -ENOENT)
                                log_error("Cannot retrieve coredump from journal nor disk.");
                        else
                                log_error_errno(r, "Failed to retrieve COREDUMP field: %m");
                        goto error;
                }

                if (temp) {
                        *path = temp;
                        *unlink_temp = true;
                }

                return 0;

error:
                if (temp) {
                        unlink(temp);
                        log_debug("Removed temporary file %s", temp);
                }
                return r;
        }
}

static int dump_core(sd_journal* j) {
        int r;

        assert(j);

        r = focus(j);
        if (r < 0)
                return r;

        print_info(arg_output ? stdout : stderr, j, false);

        if (on_tty() && !arg_output) {
                log_error("Refusing to dump core to tty.");
                return -ENOTTY;
        }

        r = save_core(j, arg_output ? fileno(arg_output) : STDOUT_FILENO, NULL, NULL);
        if (r < 0)
                return log_error_errno(r, "Coredump retrieval failed: %m");

        r = sd_journal_previous(j);
        if (r >= 0)
                log_warning("More than one entry matches, ignoring rest.");

        return 0;
}

static int run_gdb(sd_journal *j) {
        _cleanup_free_ char *exe = NULL, *path = NULL;
        bool unlink_path = false;
        const char *data;
        siginfo_t st;
        size_t len;
        pid_t pid;
        int r;

        assert(j);

        r = focus(j);
        if (r < 0)
                return r;

        print_info(stdout, j, false);
        fputs("\n", stdout);

        r = sd_journal_get_data(j, "COREDUMP_EXE", (const void**) &data, &len);
        if (r < 0)
                return log_error_errno(r, "Failed to retrieve COREDUMP_EXE field: %m");

        assert(len > strlen("COREDUMP_EXE="));
        data += strlen("COREDUMP_EXE=");
        len -= strlen("COREDUMP_EXE=");

        exe = strndup(data, len);
        if (!exe)
                return log_oom();

        if (endswith(exe, " (deleted)")) {
                log_error("Binary already deleted.");
                return -ENOENT;
        }

        if (!path_is_absolute(exe)) {
                log_error("Binary is not an absolute path.");
                return -ENOENT;
        }

        r = save_core(j, -1, &path, &unlink_path);
        if (r < 0)
                return log_error_errno(r, "Failed to retrieve core: %m");

        pid = fork();
        if (pid < 0) {
                r = log_error_errno(errno, "Failed to fork(): %m");
                goto finish;
        }
        if (pid == 0) {
                (void) reset_all_signal_handlers();
                (void) reset_signal_mask();

                execlp("gdb", "gdb", exe, path, NULL);

                log_error_errno(errno, "Failed to invoke gdb: %m");
                _exit(1);
        }

        r = wait_for_terminate(pid, &st);
        if (r < 0) {
                log_error_errno(errno, "Failed to wait for gdb: %m");
                goto finish;
        }

        r = st.si_code == CLD_EXITED ? st.si_status : 255;

finish:
        if (unlink_path) {
                log_debug("Removed temporary file %s", path);
                unlink(path);
        }

        return r;
}

int main(int argc, char *argv[]) {
        _cleanup_journal_close_ sd_journal*j = NULL;
        const char* match;
        Iterator it;
        int r = 0;
        _cleanup_set_free_free_ Set *matches = NULL;

        setlocale(LC_ALL, "");
        log_parse_environment();
        log_open();

        matches = new_matches();
        if (!matches) {
                r = -ENOMEM;
                goto end;
        }

        r = parse_argv(argc, argv, matches);
        if (r < 0)
                goto end;

        if (arg_action == ACTION_NONE)
                goto end;

        sigbus_install();

        if (arg_directory) {
                r = sd_journal_open_directory(&j, arg_directory, 0);
                if (r < 0) {
                        log_error_errno(r, "Failed to open journals in directory: %s: %m", arg_directory);
                        goto end;
                }
        } else {
                r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
                if (r < 0) {
                        log_error_errno(r, "Failed to open journal: %m");
                        goto end;
                }
        }

        /* We want full data, nothing truncated. */
        sd_journal_set_data_threshold(j, 0);

        SET_FOREACH(match, matches, it) {
                r = sd_journal_add_match(j, match, strlen(match));
                if (r != 0) {
                        log_error_errno(r, "Failed to add match '%s': %m",
                                        match);
                        goto end;
                }
        }

        if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) {
                _cleanup_free_ char *filter;

                filter = journal_make_match_string(j);
                log_debug("Journal filter: %s", filter);
        }

        switch(arg_action) {

        case ACTION_LIST:
        case ACTION_INFO:
                if (!arg_no_pager)
                        pager_open(false);

                r = dump_list(j);
                break;

        case ACTION_DUMP:
                r = dump_core(j);
                break;

        case  ACTION_GDB:
                r = run_gdb(j);
                break;

        default:
                assert_not_reached("Shouldn't be here");
        }

end:
        pager_close();

        if (arg_output)
                fclose(arg_output);

        return r >= 0 ? r : EXIT_FAILURE;
}