config: count the interfaces as they are added.

This information is useful to the various clock types.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>

config.c

@@ -607,6 +607,8 @@ struct interface *config_create_interface(char *name, struct config *cfg)
 	strncpy(iface->name, name, MAX_IFNAME_SIZE);
 	sk_get_ts_info(iface->name, &iface->ts_info);
 	STAILQ_INSERT_TAIL(&cfg->interfaces, iface, list);
+	cfg->n_interfaces++;
+
 	return iface;
 }
 

config.h

@@ -41,6 +41,7 @@ struct interface {
 struct config {
 	/* configured interfaces */
 	STAILQ_HEAD(interfaces_head, interface) interfaces;
+	int n_interfaces;
 
 	/* hash of all non-legacy items */
 	struct hash *htab;