From: Christian Kastner <ckk@kvr.at>
Date: Tue, 22 Dec 2015 19:10:30 +0100
Subject: Ensure stdin is open

Ensure stdin is open on startup. This is needed by the job execution later on.

Fix originally provided by Mustafa Mahudhawala for Red Hat's vixie cron.

Bug-Debian: https://bugs.debian.org/295589
Bug-RedHat: https://bugzilla.redhat.com/show_bug.cgi?id=145992
Forwarded: no
Last-Update: 2015-12-22
Index: cron/cron.c
===================================================================
--- cron.orig/cron.c
+++ cron/cron.c
@@ -74,6 +74,10 @@ main(argc, argv)
 #endif
 	(void) signal(SIGHUP, sighup_handler);
 
+	if (fdopen(0, "r") == NULL) {
+		(void) open("dev/null", 0);
+	}
+
 	acquire_daemonlock(0);
 	set_cron_uid();
 	set_cron_cwd();