--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-tcp-connect6-error.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,129 @@
+/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "uv.h"
+#include "task.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+static int connect_cb_called = 0;
+static int close_cb_called = 0;
+
+
+static void connect_cb(uv_connect_t* handle, int status) {
+  ASSERT_NOT_NULL(handle);
+  connect_cb_called++;
+}
+
+
+static void close_cb(uv_handle_t* handle) {
+  ASSERT_NOT_NULL(handle);
+  close_cb_called++;
+}
+
+
+TEST_IMPL(tcp_connect6_error_fault) {
+  const char garbage[] =
+      "blah blah blah blah blah blah blah blah blah blah blah blah";
+  const struct sockaddr_in6* garbage_addr;
+  uv_tcp_t server;
+  int r;
+  uv_connect_t req;
+
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
+  garbage_addr = (const struct sockaddr_in6*) &garbage;
+
+  r = uv_tcp_init(uv_default_loop(), &server);
+  ASSERT_OK(r);
+  r = uv_tcp_connect(&req,
+                     &server,
+                     (const struct sockaddr*) garbage_addr,
+                     connect_cb);
+  ASSERT_EQ(r, UV_EINVAL);
+
+  uv_close((uv_handle_t*)&server, close_cb);
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_OK(connect_cb_called);
+  ASSERT_EQ(1, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(tcp_connect6_link_local) {
+  uv_interface_address_t* ifs;
+  uv_interface_address_t* p;
+  struct sockaddr_in6 addr;
+  uv_connect_t req;
+  uv_tcp_t server;
+  int ok;
+  int n;
+
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
+#if defined(__QEMU__)
+  /* qemu's sockaddr_in6 translation is broken pre-qemu 8.0.0
+   * when host endianness != guest endiannes.
+   * Fixed in https://github.com/qemu/qemu/commit/44cf6731d6b.
+   */
+  RETURN_SKIP("Test does not currently work in QEMU");
+#endif  /* defined(__QEMU__) */
+
+  /* Check there's an interface that routes link-local (fe80::/10) traffic. */
+  ASSERT_OK(uv_interface_addresses(&ifs, &n));
+  for (p = ifs; p < &ifs[n]; p++)
+    if (p->address.address6.sin6_family == AF_INET6)
+      if (!memcmp(&p->address.address6.sin6_addr, "\xfe\x80", 2))
+        break;
+  ok = (p < &ifs[n]);
+  uv_free_interface_addresses(ifs, n);
+
+  if (!ok)
+    RETURN_SKIP("IPv6 link-local traffic not supported");
+
+  ASSERT_OK(uv_ip6_addr("fe80::0bad:babe", 1337, &addr));
+  ASSERT_OK(uv_tcp_init(uv_default_loop(), &server));
+
+  /* We're making two shaky assumptions here:
+   * 1. There is a network interface that routes IPv6 link-local traffic, and
+   * 2. There is no firewall rule that blackholes or otherwise hard-kills the
+   *    connection attempt to the address above, i.e., we don't expect the
+   *    connect() system call to fail synchronously.
+   */
+  ASSERT_OK(uv_tcp_connect(&req,
+                           &server,
+                           (struct sockaddr*) &addr,
+                           connect_cb));
+
+  uv_close((uv_handle_t*) &server, NULL);
+  ASSERT_OK(uv_run(uv_default_loop(), UV_RUN_DEFAULT));
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}