From cb7c6e391872d2922a688c77def805883b69eba8 Mon Sep 17 00:00:00 2001
From: Anshul Gupta <ansg191@anshulg.com>
Date: Mon, 1 Jun 2026 16:48:12 -0700
Subject: [PATCH] std.Io.Threaded: respect options.family in netLookup

Previously `AF_UNSPEC` was passed unconditionally to `getaddrinfo`.
This specifies `AF_INET` or `AF_INET6` depending on the value of
HostName.LookupOptions.family.

`AF_UNSPEC` is still set by default (when family == null).
---
 lib/std/Io/Threaded.zig | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 7a4e2640376345437afa5721b83f8ddb0d99453f..555ff219d308cba7647a791bf770b28b6895c6d1 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -13923,9 +13923,14 @@ fn netLookupFallible(
         var port_buffer: [8]u8 = undefined;
         const port_c = std.fmt.bufPrintSentinel(&port_buffer, "{d}", .{options.port}, 0) catch unreachable;
 
+        const family: i32 = if (options.family) |f| switch (f) {
+            .ip4 => posix.AF.INET,
+            .ip6 => posix.AF.INET6,
+        } else posix.AF.UNSPEC;
+
         const hints: posix.addrinfo = .{
             .flags = .{ .CANONNAME = options.canonical_name_buffer != null, .NUMERICSERV = true },
-            .family = posix.AF.UNSPEC,
+            .family = family,
             .socktype = posix.SOCK.STREAM,
             .protocol = posix.IPPROTO.TCP,
             .canonname = null,
-- 
2.54.0