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                 struct epoll_event event;
  74                 int t = -1;
  75                 usec_t n;
  76
  77                 n = now(CLOCK_REALTIME);
  78
  79                 if (server.max_retention_usec > 0 && server.oldest_file_usec > 0) {
  80
  81                         /* The retention time is reached, so let's vacuum! */
  82                         if (server.oldest_file_usec + server.max_retention_usec < n) {
  83                                 log_info("Retention time reached.");
  84                                 server_rotate(&server);
  85                                 server_vacuum(&server);
  86                                 continue;
  87                         }
  88
  89                         /* Calculate when to rotate the next time */
  90                         t = (int) ((server.oldest_file_usec + server.max_retention_usec - n + USEC_PER_MSEC - 1) / USEC_PER_MSEC);
  91                 }
  92
  93 #ifdef HAVE_GCRYPT
  94                 if (server.system_journal) {
  95                         usec_t u;
  96
  97                         if (journal_file_next_evolve_usec(server.system_journal, &u)) {
  98                                 if (n >= u)
  99                                         t = 0;
 100                                 else
 101                                         t = MIN(t, (int) ((u - n + USEC_PER_MSEC - 1) / USEC_PER_MSEC));
 102                         }
 103                 }
 104 #endif
 105
 106                 r = epoll_wait(server.epoll_fd, &event, 1, t);
 107                 if (r < 0) {
 108
 109                         if (errno == EINTR)
 110                                 continue;
 111
 112                         log_error("epoll_wait() failed: %m");
 113                         r = -errno;
 114                         goto finish;
 115                 }
 116
 117                 if (r > 0) {
 118                         r = process_event(&server, &event);
 119                         if (r < 0)
 120                                 goto finish;
 121                         else if (r == 0)
 122                                 break;
 123                 }
 124
 125                 server_maybe_append_tags(&server);
 126                 server_maybe_warn_forward_syslog_missed(&server);
 127         }
 128
 129         log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
 130         server_driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
 131
 132 finish:
 133         sd_notify(false,
 134                   "STATUS=Shutting down...");
 135
 136         server_done(&server);
 137
 138         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 139 }