--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-tcp-connect-timeout.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,196 @@
+/* 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>
+
+
+static int connect_cb_called;
+static int close_cb_called;
+
+static uv_connect_t connect_req;
+static uv_timer_t timer;
+static uv_tcp_t conn;
+
+static void connect_cb(uv_connect_t* req, int status);
+static void timer_cb(uv_timer_t* handle);
+static void close_cb(uv_handle_t* handle);
+
+
+static void connect_cb(uv_connect_t* req, int status) {
+  ASSERT_PTR_EQ(req, &connect_req);
+  ASSERT_EQ(status, UV_ECANCELED);
+  connect_cb_called++;
+}
+
+
+static void timer_cb(uv_timer_t* handle) {
+  ASSERT_PTR_EQ(handle, &timer);
+  uv_close((uv_handle_t*)&conn, close_cb);
+  uv_close((uv_handle_t*)&timer, close_cb);
+}
+
+
+static void close_cb(uv_handle_t* handle) {
+  ASSERT(handle == (uv_handle_t*)&conn || handle == (uv_handle_t*)&timer);
+  close_cb_called++;
+}
+
+
+/* Verify that connecting to an unreachable address or port doesn't hang
+ * the event loop.
+ */
+TEST_IMPL(tcp_connect_timeout) {
+  struct sockaddr_in addr;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("8.8.8.8", 9999, &addr));
+
+  r = uv_timer_init(uv_default_loop(), &timer);
+  ASSERT_OK(r);
+
+  r = uv_timer_start(&timer, timer_cb, 50, 0);
+  ASSERT_OK(r);
+
+  r = uv_tcp_init(uv_default_loop(), &conn);
+  ASSERT_OK(r);
+
+  r = uv_tcp_connect(&connect_req,
+                     &conn,
+                     (const struct sockaddr*) &addr,
+                     connect_cb);
+  if (r == UV_ENETUNREACH)
+    RETURN_SKIP("Network unreachable.");
+  ASSERT_OK(r);
+
+  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+/* Make sure connect fails instantly if the target is nonexisting
+ * local port.
+ */
+
+static void connect_local_cb(uv_connect_t* req, int status) {
+  ASSERT_PTR_EQ(req, &connect_req);
+  ASSERT_NE(status, UV_ECANCELED);
+  connect_cb_called++;
+}
+
+static int is_supported_system(void) {
+  int semver[3];
+  int min_semver[3] = {10, 0, 16299};
+  int cnt;
+  uv_utsname_t uname;
+  ASSERT_OK(uv_os_uname(&uname));
+  if (strcmp(uname.sysname, "Windows_NT") == 0) {
+    cnt = sscanf(uname.release, "%d.%d.%d", &semver[0], &semver[1], &semver[2]);
+    if (cnt != 3) {
+      return 0;
+    }
+    /* release >= 10.0.16299 */
+    for (cnt = 0; cnt < 3; ++cnt) {
+      if (semver[cnt] > min_semver[cnt])
+        return 1;
+      if (semver[cnt] < min_semver[cnt])
+        return 0;
+    }
+    return 1;
+  }
+  return 1;
+}
+
+TEST_IMPL(tcp_local_connect_timeout) {
+  struct sockaddr_in addr;
+  int r;
+
+  if (!is_supported_system()) {
+    RETURN_SKIP("Unsupported system");
+  }
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  r = uv_timer_init(uv_default_loop(), &timer);
+  ASSERT_OK(r);
+
+  /* Give it 1s to timeout. */
+  r = uv_timer_start(&timer, timer_cb, 1000, 0);
+  ASSERT_OK(r);
+
+  r = uv_tcp_init(uv_default_loop(), &conn);
+  ASSERT_OK(r);
+
+  r = uv_tcp_connect(&connect_req,
+                     &conn,
+                     (const struct sockaddr*) &addr,
+                     connect_local_cb);
+  if (r == UV_ENETUNREACH)
+    RETURN_SKIP("Network unreachable.");
+  ASSERT_OK(r);
+
+  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+TEST_IMPL(tcp6_local_connect_timeout) {
+  struct sockaddr_in6 addr;
+  int r;
+
+  if (!is_supported_system()) {
+    RETURN_SKIP("Unsupported system");
+  }
+  if (!can_ipv6()) {
+    RETURN_SKIP("IPv6 not supported");
+  }
+
+  ASSERT_OK(uv_ip6_addr("::1", 9999, &addr));
+
+  r = uv_timer_init(uv_default_loop(), &timer);
+  ASSERT_OK(r);
+
+  /* Give it 1s to timeout. */
+  r = uv_timer_start(&timer, timer_cb, 1000, 0);
+  ASSERT_OK(r);
+
+  r = uv_tcp_init(uv_default_loop(), &conn);
+  ASSERT_OK(r);
+
+  r = uv_tcp_connect(&connect_req,
+                     &conn,
+                     (const struct sockaddr*) &addr,
+                     connect_local_cb);
+  if (r == UV_ENETUNREACH)
+    RETURN_SKIP("Network unreachable.");
+  ASSERT_OK(r);
+
+  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}