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From 497ef904d544ac51de43934549dbeccce8e6e8f8 Mon Sep 17 00:00:00 2001
From: Azat Khuzhin <azat@libevent.org>
Date: Mon, 1 Jul 2019 23:54:02 +0300
Subject: [PATCH] Warn if forked from the event loop during event_reinit()
Calling fork() from the event loop is not a great idea, since at least
it shares some internal pipes (for handling signals) before
event_reinit() call
Closes: #833
---
event.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/event.c b/event.c
index fa4f2802e..aa6c6fba3 100644
--- a/event.c
+++ b/event.c
@@ -1003,6 +1003,12 @@ event_reinit(struct event_base *base)
EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+ if (base->running_loop) {
+ event_warnx("%s: forked from the event_loop.", __func__);
+ res = -1;
+ goto done;
+ }
+
evsel = base->evsel;
/* check if this event mechanism requires reinit on the backend */
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