--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-poll-closesocket.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,92 @@
+/* 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 <errno.h>
+
+#include "uv.h"
+#include "task.h"
+
+#ifdef _WIN32
+static uv_os_sock_t sock;
+static uv_poll_t handle;
+static int close_cb_called = 0;
+
+
+static void close_cb(uv_handle_t* h) {
+  close_cb_called++;
+}
+
+
+static void poll_cb(uv_poll_t* h, int status, int events) {
+  int r;
+
+  ASSERT_OK(status);
+  ASSERT_PTR_EQ(h, &handle);
+
+  r = uv_poll_start(&handle, UV_READABLE, poll_cb);
+  ASSERT_OK(r);
+
+  closesocket(sock);
+  uv_close((uv_handle_t*) &handle, close_cb);
+
+}
+#endif
+
+
+TEST_IMPL(poll_closesocket) {
+#ifndef _WIN32
+  RETURN_SKIP("Test only relevant on Windows");
+#else
+  struct WSAData wsa_data;
+  int r;
+  unsigned long on;
+  struct sockaddr_in addr;
+
+  r = WSAStartup(MAKEWORD(2, 2), &wsa_data);
+  ASSERT_OK(r);
+
+  sock = socket(AF_INET, SOCK_STREAM, 0);
+  ASSERT_NE(sock, INVALID_SOCKET);
+  on = 1;
+  r = ioctlsocket(sock, FIONBIO, &on);
+  ASSERT_OK(r);
+
+  r = uv_ip4_addr("127.0.0.1", TEST_PORT, &addr);
+  ASSERT_OK(r);
+
+  r = connect(sock, (const struct sockaddr*) &addr, sizeof addr);
+  ASSERT(r);
+  ASSERT_EQ(WSAGetLastError(), WSAEWOULDBLOCK);
+
+  r = uv_poll_init_socket(uv_default_loop(), &handle, sock);
+  ASSERT_OK(r);
+  r = uv_poll_start(&handle, UV_WRITABLE, poll_cb);
+  ASSERT_OK(r);
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_EQ(1, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+#endif
+}