Index: parse.y
===================================================================
RCS file: /cvs/src/sbin/unwind/parse.y,v
retrieving revision 1.29
diff -u -p -r1.29 parse.y
--- parse.y	22 Oct 2021 15:03:28 -0000	1.29
+++ parse.y	21 Mar 2022 04:46:54 -0000
@@ -786,8 +786,9 @@ popfile(void)
 }
 
 struct uw_conf *
-parse_config(char *filename)
+parse_config(const char *filename)
 {
+	extern const char		 default_conffile[];
 	static enum uw_resolver_type	 default_res_pref[] = {
 	    UW_RES_DOT,
 	    UW_RES_ODOT_FORWARDER,
@@ -807,10 +808,10 @@ parse_config(char *filename)
 	for (i = 0; i < conf->res_pref.len; i++)
 		conf->enabled_resolvers[conf->res_pref.types[i]] = 1;
 
-	file = pushfile(filename != NULL ? filename : _PATH_CONF_FILE, 0);
+	file = pushfile(filename, 0);
 	if (file == NULL) {
 		/* no default config file is fine */
-		if (errno == ENOENT && filename == NULL)
+		if (errno == ENOENT && filename == default_conffile)
 			return (conf);
 		log_warn("%s", filename);
 		free(conf);
Index: unwind.c
===================================================================
RCS file: /cvs/src/sbin/unwind/unwind.c,v
retrieving revision 1.67
diff -u -p -r1.67 unwind.c
--- unwind.c	18 Dec 2021 10:34:19 -0000	1.67
+++ unwind.c	21 Mar 2022 04:46:54 -0000
@@ -78,7 +78,8 @@ void		send_blocklist_fd(void);
 struct uw_conf		*main_conf;
 static struct imsgev	*iev_frontend;
 static struct imsgev	*iev_resolver;
-char			*conffile;
+const char		 default_conffile[] = _PATH_CONF_FILE;
+const char		*conffile = default_conffile;
 pid_t			 frontend_pid;
 pid_t			 resolver_pid;
 uint32_t		 cmd_opts;
Index: unwind.h
===================================================================
RCS file: /cvs/src/sbin/unwind/unwind.h,v
retrieving revision 1.56
diff -u -p -r1.56 unwind.h
--- unwind.h	31 Aug 2021 20:18:03 -0000	1.56
+++ unwind.h	21 Mar 2022 04:46:54 -0000
@@ -193,7 +193,7 @@ void		 config_clear(struct uw_conf *);
 void	print_config(struct uw_conf *);
 
 /* parse.y */
-struct uw_conf	*parse_config(char *);
+struct uw_conf	*parse_config(const char *);
 int		 cmdline_symset(char *);
 
 RB_PROTOTYPE(force_tree, force_tree_entry, entry, force_tree_cmp);