e96d6be763
This adds minimal hardware watchdog support to PID 1. The idea is that PID 1 supervises and watchdogs system services, while the hardware watchdog is used to supervise PID 1. This adds two hardware watchdog configuration options, for the runtime watchdog and for a shutdown watchdog. The former is active during normal operation, the latter only at reboots to ensure that if a clean reboot times out we reboot nonetheless. If the runtime watchdog is enabled PID 1 will automatically wake up at half the configured interval and write to the watchdog daemon. By default we enable the shutdown watchdog, but leave the runtime watchdog disabled in order not to break independent hardware watchdog daemons people might be using. This is only the most basic hookup. If necessary we can later on hook up the watchdog ping more closely with services deemed crucial.
52 lines
1.4 KiB
C
52 lines
1.4 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 2012 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 General Public License as published by
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the Free Software Foundation; either version 2 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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General Public License for more details.
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You should have received a copy of the GNU 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 <string.h>
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#include "watchdog.h"
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#include "log.h"
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int main(int argc, char *argv[]) {
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usec_t t = 10 * USEC_PER_SEC;
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unsigned i;
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int r;
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log_set_max_level(LOG_DEBUG);
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log_parse_environment();
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r = watchdog_set_timeout(&t);
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if (r < 0)
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log_warning("Failed to open watchdog: %s", strerror(-r));
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for (i = 0; i < 5; i++) {
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log_info("Pinging...");
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r = watchdog_ping();
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if (r < 0)
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log_warning("Failed to ping watchdog: %s", strerror(-r));
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usleep(t/2);
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}
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watchdog_close(true);
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return 0;
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}
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