diff -up dnscap-20070807cvs/dnscap.c.system dnscap-20070807cvs/dnscap.c
--- dnscap-20070807cvs/dnscap.c.system	2007-08-07 15:13:56.000000000 +0200
+++ dnscap-20070807cvs/dnscap.c	2007-08-07 15:14:30.000000000 +0200
@@ -1468,7 +1468,8 @@ dumper_close(void) {
 		if (cmd != NULL) {
 			setuid(getuid());
 			setgid(getgid());
-			system(cmd);
+			if (system(cmd) == -1)
+				abort ();
 			free(cmd);
 		}
 	}