upd2

examples/host_fqdn.v

@@ -0,0 +1,16 @@
+import netio
+import os
+
+fn main() {
+	// Resolve the fully qualified domain name for host.
+	// This programm is analog for `hostname -f` command.
+	hostname := os.hostname()!
+	ai := netio.translate_addr(node: hostname, flags: netio.ai_canonname)!
+	mut fqdn := ''
+	for a in ai {
+		// Not needed to iterate over all entries, return the first one per getaddrinfo(3).
+		fqdn = a.canonical
+		break
+	}
+	println(fqdn)
+}