src/journal/journald.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 Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/epoll.h>
  23 #include <sys/socket.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26
  27 #include <systemd/sd-journal.h>
  28 #include <systemd/sd-messages.h>
  29 #include <systemd/sd-daemon.h>
  30
  31 #include "journal-authenticate.h"
  32 #include "journald-server.h"
  33 #include "journald-kmsg.h"
  34 #include "journald-syslog.h"
  35
  36 int main(int argc, char *argv[]) {
  37         Server server;
  38         int r;
  39
  40         /* if (getppid() != 1) { */
  41         /*         log_error("This program should be invoked by init only."); */
  42         /*         return EXIT_FAILURE; */
  43         /* } */
  44
  45         if (argc > 1) {
  46                 log_error("This program does not take arguments.");
  47                 return EXIT_FAILURE;
  48         }
  49
  50         log_set_target(LOG_TARGET_SAFE);
  51         log_set_facility(LOG_SYSLOG);
  52         log_parse_environment();
  53         log_open();
  54
  55         umask(0022);
  56
  57         r = server_init(&server);
  58         if (r < 0)
  59                 goto finish;
  60
  61         server_vacuum(&server);
  62         server_flush_to_var(&server);
  63         server_flush_dev_kmsg(&server);
  64
  65         log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
  66         server_driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
  67
  68         sd_notify(false,
  69                   "READY=1\n"
  70                   "STATUS=Processing requests...");
  71
  72         for (;;) {
  73                 usec_t t = (usec_t) -1, n;
  74
  75                 r = sd_event_get_state(server.event);
  76                 if (r < 0)
  77                         goto finish;
  78                 if (r == SD_EVENT_FINISHED)
  79                         break;
  80
  81                 n = now(CLOCK_REALTIME);
  82
  83                 if (server.max_retention_usec > 0 && server.oldest_file_usec > 0) {
  84
  85                         /* The retention time is reached, so let's vacuum! */
  86                         if (server.oldest_file_usec + server.max_retention_usec < n) {
  87                                 log_info("Retention time reached.");
  88                                 server_rotate(&server);
  89                                 server_vacuum(&server);
  90                                 continue;
  91                         }
  92
  93                         /* Calculate when to rotate the next time */
  94                         t = server.oldest_file_usec + server.max_retention_usec - n;
  95                 }
  96
  97 #ifdef HAVE_GCRYPT
  98                 if (server.system_journal) {
  99                         usec_t u;
 100
 101                         if (journal_file_next_evolve_usec(server.system_journal, &u)) {
 102                                 if (n >= u)
 103                                         t = 0;
 104                                 else
 105                                         t = MIN(t, u - n);
 106                         }
 107                 }
 108 #endif
 109
 110                 r = sd_event_run(server.event, t);
 111                 if (r < 0) {
 112                         log_error("Failed to run event loop: %s", strerror(-r));
 113                         goto finish;
 114                 }
 115
 116                 server_maybe_append_tags(&server);
 117                 server_maybe_warn_forward_syslog_missed(&server);
 118         }
 119
 120         log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
 121         server_driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
 122
 123 finish:
 124         sd_notify(false, "STATUS=Shutting down...");
 125
 126         server_done(&server);
 127
 128         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 129 }