Do not try to shut down the event loop when it is not initialized.

Doing so caused us to crash in some unusual circumstances, such as
using --verify-config to verify a configuration that failed during
the options_act() stage.

Fixes bug 32407; bugfix on 0.3.3.1-alpha.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/lib/evloop/compat_libevent.c b/src/lib/evloop/compat_libevent.c
index 91eacb9938..939d77f857 100644
--- a/src/lib/evloop/compat_libevent.c
+++ b/src/lib/evloop/compat_libevent.c
@@ -181,6 +181,16 @@ tor_libevent_initialize(tor_libevent_cfg *torcfg)
       event_get_version(), tor_libevent_get_method());
 }
 
+/**
+ * Return true iff the libevent module has been successfully initialized,
+ * and not subsequently shut down.
+ **/
+bool
+tor_libevent_is_initialized(void)
+{
+  return the_event_base != NULL;
+}
+
 /** Return the current Libevent event base that we're set up to use. */
 MOCK_IMPL(struct event_base *,
 tor_libevent_get_base, (void))