From: David Vašek <david.vasek@nic.cz>
Date: Fri, 25 Aug 2023 10:49:04 +0000 (+0200)
Subject: utils: allow a repeated signal
X-Git-Tag: v3.4.dev~9^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ceedab026266ea4218c1ced42e9f6cee34f69931;p=thirdparty%2Fknot-dns.git

utils: allow a repeated signal

It can help when the running handler gets stuck and the user needs to terminate the utility anyway.
---

diff --git a/src/utils/common/signal.c b/src/utils/common/signal.c
index df95ba7945..b46e40d8eb 100644
--- a/src/utils/common/signal.c
+++ b/src/utils/common/signal.c
@@ -26,6 +26,12 @@ int SIGNAL_REPEAT = 1;
 
 static void signal_handler(int signum)
 {
+	// Allow a repeated signal during the handler run (in case
+	// the handler gets stuck).
+	sigset_t set;
+	(void)sigaddset(&set, signum);
+	(void)sigprocmask(SIG_UNBLOCK, &set, NULL);
+
 	if (--SIGNAL_REPEAT < 0) {
 		abort();
 	}