--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-tcp-create-socket-early.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,213 @@
+/* Copyright (c) 2015 Saúl Ibarra Corretgé <[email protected]>.
+ * 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 <string.h>
+
+#ifdef _WIN32
+# define INVALID_FD (INVALID_HANDLE_VALUE)
+#else
+# define INVALID_FD (-1)
+#endif
+
+
+static void on_connect(uv_connect_t* req, int status) {
+  ASSERT_OK(status);
+  uv_close((uv_handle_t*) req->handle, NULL);
+}
+
+
+static void on_connection(uv_stream_t* server, int status) {
+  uv_tcp_t* handle;
+  int r;
+
+  ASSERT_OK(status);
+
+  handle = malloc(sizeof(*handle));
+  ASSERT_NOT_NULL(handle);
+
+  r = uv_tcp_init_ex(server->loop, handle, AF_INET);
+  ASSERT_OK(r);
+
+  r = uv_accept(server, (uv_stream_t*)handle);
+  ASSERT_EQ(r, UV_EBUSY);
+
+  uv_close((uv_handle_t*) server, NULL);
+  uv_close((uv_handle_t*) handle, (uv_close_cb)free);
+}
+
+
+static void tcp_listener(uv_loop_t* loop, uv_tcp_t* server) {
+  struct sockaddr_in addr;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("0.0.0.0", TEST_PORT, &addr));
+
+  r = uv_tcp_init(loop, server);
+  ASSERT_OK(r);
+
+  r = uv_tcp_bind(server, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  r = uv_listen((uv_stream_t*) server, 128, on_connection);
+  ASSERT_OK(r);
+}
+
+
+static void tcp_connector(uv_loop_t* loop, uv_tcp_t* client, uv_connect_t* req) {
+  struct sockaddr_in server_addr;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &server_addr));
+
+  r = uv_tcp_init(loop, client);
+  ASSERT_OK(r);
+
+  r = uv_tcp_connect(req,
+                     client,
+                     (const struct sockaddr*) &server_addr,
+                     on_connect);
+  ASSERT_OK(r);
+}
+
+
+TEST_IMPL(tcp_create_early) {
+  struct sockaddr_in addr;
+  struct sockaddr_in sockname;
+  uv_tcp_t client;
+  uv_os_fd_t fd;
+  int r, namelen;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  r = uv_tcp_init_ex(uv_default_loop(), &client, AF_INET);
+  ASSERT_OK(r);
+
+  r = uv_fileno((const uv_handle_t*) &client, &fd);
+  ASSERT_OK(r);
+
+  /* Windows returns WSAEINVAL if the socket is not bound */
+#ifndef _WIN32
+  ASSERT_NE(fd, INVALID_FD);
+  namelen = sizeof sockname;
+  r = uv_tcp_getsockname(&client, (struct sockaddr*) &sockname, &namelen);
+  ASSERT_OK(r);
+  ASSERT_EQ(sockname.sin_family, AF_INET);
+#else
+  ASSERT_PTR_NE(fd, INVALID_FD);
+#endif
+
+  r = uv_tcp_bind(&client, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  namelen = sizeof sockname;
+  r = uv_tcp_getsockname(&client, (struct sockaddr*) &sockname, &namelen);
+  ASSERT_OK(r);
+  ASSERT_OK(memcmp(&addr.sin_addr,
+                   &sockname.sin_addr,
+                   sizeof(addr.sin_addr)));
+
+  uv_close((uv_handle_t*) &client, NULL);
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(tcp_create_early_bad_bind) {
+  struct sockaddr_in addr;
+  uv_tcp_t client;
+  uv_os_fd_t fd;
+  int r;
+
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  r = uv_tcp_init_ex(uv_default_loop(), &client, AF_INET6);
+  ASSERT_OK(r);
+
+  r = uv_fileno((const uv_handle_t*) &client, &fd);
+  ASSERT_OK(r);
+
+  /* Windows returns WSAEINVAL if the socket is not bound */
+#ifndef _WIN32
+  ASSERT_NE(fd, INVALID_FD);
+  {
+    int namelen;
+    struct sockaddr_in6 sockname;
+    namelen = sizeof sockname;
+    r = uv_tcp_getsockname(&client, (struct sockaddr*) &sockname, &namelen);
+    ASSERT_OK(r);
+    ASSERT_EQ(sockname.sin6_family, AF_INET6);
+  }
+#else 
+  ASSERT_PTR_NE(fd, INVALID_FD);
+#endif
+
+  r = uv_tcp_bind(&client, (const struct sockaddr*) &addr, 0);
+#if !defined(_WIN32) && !defined(__CYGWIN__) && !defined(__MSYS__)
+  ASSERT_EQ(r, UV_EINVAL);
+#else
+  ASSERT_EQ(r, UV_EFAULT);
+#endif
+
+  uv_close((uv_handle_t*) &client, NULL);
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(tcp_create_early_bad_domain) {
+  uv_tcp_t client;
+  int r;
+
+  r = uv_tcp_init_ex(uv_default_loop(), &client, 47);
+  ASSERT_EQ(r, UV_EINVAL);
+
+  r = uv_tcp_init_ex(uv_default_loop(), &client, 1024);
+  ASSERT_EQ(r, UV_EINVAL);
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(tcp_create_early_accept) {
+  uv_tcp_t client, server;
+  uv_connect_t connect_req;
+
+  tcp_listener(uv_default_loop(), &server);
+  tcp_connector(uv_default_loop(), &client, &connect_req);
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}