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Add support for systemd watchdog protocol

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It work by notifying systemd on a regular basis. If
there is no notification, the daemon is restarted.
This requires a version newer than the 209 version
of systemd, as it is not supported before.
This commit is contained in:
Michael Scherer 2014-12-23 11:22:42 -05:00 committed by Nick Mathewson
parent aabaed6f49
commit 29ac883606
2 changed files with 49 additions and 0 deletions
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20
configure.ac
View File

@ -138,6 +138,26 @@ if test x$enable_systemd = xyes -a x$have_systemd != xyes ; then
AC_MSG_ERROR([Explicitly requested systemd support, but systemd not found])
fi
AC_ARG_ENABLE(threads,
AS_HELP_STRING(--disable-threads, disable multi-threading support))
if test x$enable_threads = x; then
case $host in
*-*-solaris* )
# Don't try multithreading on solaris -- cpuworkers seem to lock.
AC_MSG_NOTICE([You are running Solaris; Sometimes threading makes
cpu workers lock up here, so I will disable threads.])
enable_threads="no";;
*)
enable_threads="yes";;
esac
fi
ifdef([HAVE_SYSTEMD], [
AC_SEARCH_LIBS([sd_watchdog_enabled], [systemd-daemon],
[AC_DEFINE(HAVE_SYSTEMD_209,1,[Have systemd v209 or more])], [])
])
case $host in
*-*-solaris* )
AC_DEFINE(_REENTRANT, 1, [Define on some platforms to activate x_r() functions in time.h])

29
src/or/main.c
View File

@ -1763,6 +1763,17 @@ second_elapsed_callback(periodic_timer_t *timer, void *arg)
current_second = now; /* remember which second it is, for next time */
}
#ifdef HAVE_SYSTEMD_209
static periodic_timer_t *systemd_watchdog_timer = NULL;
/** Libevent callback: invoked to reset systemd watchdog. */
static void
systemd_watchdog_callback(periodic_timer_t *timer, void *arg)
{
sd_notify(1, "WATCHDOG=1");
}
#endif
#ifndef USE_BUFFEREVENTS
/** Timer: used to invoke refill_callback(). */
static periodic_timer_t *refill_timer = NULL;
@ -2031,6 +2042,24 @@ do_main_loop(void)
tor_assert(second_timer);
}
#ifdef HAVE_SYSTEMD_209
uint64_t watchdog_delay;
/* set up systemd watchdog notification. */
if (sd_watchdog_enabled(1, &watchdog_delay)) {
if (! systemd_watchdog_timer) {
struct timeval watchdog;
watchdog.tv_sec = 0;
watchdog.tv_usec = watchdog_delay/2;
systemd_watchdog_timer = periodic_timer_new(tor_libevent_get_base(),
&watchdog,
systemd_watchdog_callback,
NULL);
tor_assert(systemd_watchdog_timer);
}
}
#endif
#ifndef USE_BUFFEREVENTS
if (!refill_timer) {
struct timeval refill_interval;