-/* Decode the Unix address SUN to an Internet address SIN. Returns zero on
- * success; -1 on failure (e.g., it wasn't one of our addresses). */
+/* Decode the Unix address SUN to an Internet address SIN. If
+ * DECODE_UNBOUND_P is nonzero, an empty address (indicative of an unbound
+ * Unix-domain socket) is translated to a wildcard Internet address. Returns
+ * zero on success; -1 on failure (e.g., it wasn't one of our addresses).
+ */