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Adjust systemd watchdog support
Document why we divide it by two. Check for > 0 instead of nonzero for success, since that's what the manpage says. Allow watchdog timers greater than 1 second.
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@ -2045,11 +2045,15 @@ do_main_loop(void)
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#ifdef HAVE_SYSTEMD_209
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uint64_t watchdog_delay;
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/* set up systemd watchdog notification. */
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if (sd_watchdog_enabled(1, &watchdog_delay)) {
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if (sd_watchdog_enabled(1, &watchdog_delay) > 0) {
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if (! systemd_watchdog_timer) {
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struct timeval watchdog;
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watchdog.tv_sec = 0;
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watchdog.tv_usec = watchdog_delay/2;
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/* The manager will "act on" us if we don't send them a notification
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* every 'watchdog_delay' microseconds. So, send notifications twice
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* that often. */
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watchdog_delay /= 2;
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watchdog.tv_sec = watchdog_delay / 1000000;
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watchdog.tv_usec = watchdog_delay % 1000000;
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systemd_watchdog_timer = periodic_timer_new(tor_libevent_get_base(),
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&watchdog,
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