+/* This is a fatal_signal_add_hook() callback (via unlink_files()). It will be
+ * invoked from an asynchronous signal handler, so it cannot call most C
+ * library functions (unlink() is an explicit exception, see
+ * http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_04.html).
+ * That includes free(), so it doesn't try to free the 'files' data
+ * structure. */