src/journal/journalctl.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 <fcntl.h>
  23 #include <errno.h>
  24 #include <stddef.h>
  25
  26 #include "journal-private.h"
  27
  28 int main(int argc, char *argv[]) {
  29         int r;
  30         JournalFile *f;
  31         Object *o = NULL;
  32
  33         log_parse_environment();
  34         log_open();
  35
  36         r = journal_file_open("/var/log/journal/system.journal", O_RDONLY, 0644, &f);
  37         if (r == -ENOENT)
  38                 r = journal_file_open("/run/log/journal/system.journal", O_RDONLY, 0644, &f);
  39
  40         if (r < 0) {
  41                 log_error("Failed to open journal: %s", strerror(-r));
  42                 return EXIT_FAILURE;
  43         }
  44
  45         for (;;) {
  46                 uint64_t offset;
  47                 uint64_t n, i;
  48
  49                 r = journal_file_next_entry(f, o, &o, &offset);
  50                 if (r < 0) {
  51                         log_error("Failed to read journal: %s", strerror(-r));
  52                         goto finish;
  53                 }
  54
  55                 if (r == 0)
  56                         break;
  57
  58                 printf("entry: %llu\n", (unsigned long long) le64toh(o->entry.seqnum));
  59
  60                 n = journal_file_entry_n_items(o);
  61                 for (i = 0; i < n; i++) {
  62                         uint64_t p, l;
  63
  64                         p = le64toh(o->entry.items[i].object_offset);
  65                         r = journal_file_move_to_object(f, p, &o);
  66                         if (r < 0) {
  67                                 log_error("Failed to move to data: %s", strerror(-r));
  68                                 goto finish;
  69                         }
  70
  71                         if (le64toh(o->object.type) != OBJECT_DATA) {
  72                                 log_error("Invalid file");
  73                                 goto finish;
  74                         }
  75
  76                         l = o->object.size - offsetof(Object, data.payload);
  77                         printf("\t[%.*s]\n", (int) l, o->data.payload);
  78
  79                         r = journal_file_move_to_object(f, offset, &o);
  80                         if (r < 0) {
  81                                 log_error("Failed to move back to entry: %s", strerror(-r));
  82                                 goto finish;
  83                         }
  84                 }
  85         }
  86
  87 finish:
  88         journal_file_close(f);
  89
  90         return 0;
  91 }