src/journal/journald.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2011 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <unistd.h>
  21
  22 #include "sd-daemon.h"
  23 #include "sd-messages.h"
  24
  25 #include "format-util.h"
  26 #include "journal-authenticate.h"
  27 #include "journald-kmsg.h"
  28 #include "journald-server.h"
  29 #include "journald-syslog.h"
  30 #include "sigbus.h"
  31
  32 int main(int argc, char *argv[]) {
  33         Server server;
  34         int r;
  35
  36         if (argc > 1) {
  37                 log_error("This program does not take arguments.");
  38                 return EXIT_FAILURE;
  39         }
  40
  41         log_set_target(LOG_TARGET_SAFE);
  42         log_set_facility(LOG_SYSLOG);
  43         log_parse_environment();
  44         log_open();
  45
  46         umask(0022);
  47
  48         sigbus_install();
  49
  50         r = server_init(&server);
  51         if (r < 0)
  52                 goto finish;
  53
  54         server_vacuum(&server, false);
  55         server_flush_to_var(&server, true);
  56         server_flush_dev_kmsg(&server);
  57
  58         log_debug("systemd-journald running as pid "PID_FMT, getpid_cached());
  59         server_driver_message(&server,
  60                               "MESSAGE_ID=" SD_MESSAGE_JOURNAL_START_STR,
  61                               LOG_MESSAGE("Journal started"),
  62                               NULL);
  63
  64         /* Make sure to send the usage message *after* flushing the
  65          * journal so entries from the runtime journals are ordered
  66          * before this message. See #4190 for some details. */
  67         server_space_usage_message(&server, NULL);
  68
  69         for (;;) {
  70                 usec_t t = USEC_INFINITY, n;
  71
  72                 r = sd_event_get_state(server.event);
  73                 if (r < 0)
  74                         goto finish;
  75                 if (r == SD_EVENT_FINISHED)
  76                         break;
  77
  78                 n = now(CLOCK_REALTIME);
  79
  80                 if (server.max_retention_usec > 0 && server.oldest_file_usec > 0) {
  81
  82                         /* The retention time is reached, so let's vacuum! */
  83                         if (server.oldest_file_usec + server.max_retention_usec < n) {
  84                                 log_info("Retention time reached.");
  85                                 server_rotate(&server);
  86                                 server_vacuum(&server, false);
  87                                 continue;
  88                         }
  89
  90                         /* Calculate when to rotate the next time */
  91                         t = server.oldest_file_usec + server.max_retention_usec - n;
  92                 }
  93
  94 #if HAVE_GCRYPT
  95                 if (server.system_journal) {
  96                         usec_t u;
  97
  98                         if (journal_file_next_evolve_usec(server.system_journal, &u)) {
  99                                 if (n >= u)
 100                                         t = 0;
 101                                 else
 102                                         t = MIN(t, u - n);
 103                         }
 104                 }
 105 #endif
 106
 107                 r = sd_event_run(server.event, t);
 108                 if (r < 0) {
 109                         log_error_errno(r, "Failed to run event loop: %m");
 110                         goto finish;
 111                 }
 112
 113                 server_maybe_append_tags(&server);
 114                 server_maybe_warn_forward_syslog_missed(&server);
 115         }
 116
 117         log_debug("systemd-journald stopped as pid "PID_FMT, getpid_cached());
 118         server_driver_message(&server,
 119                               "MESSAGE_ID=" SD_MESSAGE_JOURNAL_STOP_STR,
 120                               LOG_MESSAGE("Journal stopped"),
 121                               NULL);
 122
 123 finish:
 124         server_done(&server);
 125
 126         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 127 }