e22aa3d328
Otherwise we might run into deadlocks, when journald blocks on the notify socket on PID 1, and PID 1 blocks on IPC to dbus-daemon and dbus-daemon blocks on logging to journald. Break this cycle by making sure that journald never ever blocks on PID 1. Note that this change disables support for event loop watchdog support, as these messages are sent in blocking style by sd-event. That should not be a big loss though, as people reported frequent problems with the watchdog hitting journald on excessively slow IO. Fixes: #1505.
120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <unistd.h>
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#include "sd-messages.h"
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#include "sd-daemon.h"
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#include "journal-authenticate.h"
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#include "journald-server.h"
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#include "journald-kmsg.h"
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#include "journald-syslog.h"
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#include "sigbus.h"
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#include "formats-util.h"
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int main(int argc, char *argv[]) {
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Server server;
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int r;
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if (argc > 1) {
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log_error("This program does not take arguments.");
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return EXIT_FAILURE;
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}
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log_set_target(LOG_TARGET_SAFE);
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log_set_facility(LOG_SYSLOG);
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log_parse_environment();
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log_open();
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umask(0022);
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sigbus_install();
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r = server_init(&server);
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if (r < 0)
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goto finish;
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server_vacuum(&server, false, false);
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server_flush_to_var(&server);
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server_flush_dev_kmsg(&server);
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log_debug("systemd-journald running as pid "PID_FMT, getpid());
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server_driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
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for (;;) {
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usec_t t = USEC_INFINITY, n;
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r = sd_event_get_state(server.event);
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if (r < 0)
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goto finish;
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if (r == SD_EVENT_FINISHED)
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break;
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n = now(CLOCK_REALTIME);
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if (server.max_retention_usec > 0 && server.oldest_file_usec > 0) {
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/* The retention time is reached, so let's vacuum! */
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if (server.oldest_file_usec + server.max_retention_usec < n) {
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log_info("Retention time reached.");
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server_rotate(&server);
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server_vacuum(&server, false, false);
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continue;
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}
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/* Calculate when to rotate the next time */
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t = server.oldest_file_usec + server.max_retention_usec - n;
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}
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#ifdef HAVE_GCRYPT
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if (server.system_journal) {
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usec_t u;
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if (journal_file_next_evolve_usec(server.system_journal, &u)) {
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if (n >= u)
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t = 0;
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else
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t = MIN(t, u - n);
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}
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}
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#endif
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r = sd_event_run(server.event, t);
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if (r < 0) {
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log_error_errno(r, "Failed to run event loop: %m");
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goto finish;
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}
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server_maybe_append_tags(&server);
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server_maybe_warn_forward_syslog_missed(&server);
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}
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log_debug("systemd-journald stopped as pid "PID_FMT, getpid());
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server_driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
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finish:
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server_done(&server);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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