added a more graceful termination of workers.

src/main.c

@@ -535,8 +535,9 @@ int main(int argc, char** argv)
 
 	for (;;) {
 		if (terminate != 0) {
+			mslog(&s, NULL, LOG_DEBUG, "termination signal received; waiting for children to die");
 			kill_children(&clist);
-			sleep(1);
+			while (waitpid(-1, NULL, 0) > 0);
 			exit(0);
 		}