--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-tcp-open.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,407 @@
+/* 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>
+
+#ifndef _WIN32
+# include <unistd.h>
+#endif
+
+static int shutdown_cb_called = 0;
+static int shutdown_requested = 0;
+static int connect_cb_called = 0;
+static int write_cb_called = 0;
+static int close_cb_called = 0;
+
+static uv_connect_t connect_req;
+static uv_shutdown_t shutdown_req;
+static uv_write_t write_req;
+static uv_timer_t tm;
+static uv_tcp_t client;
+
+
+static void startup(void) {
+#ifdef _WIN32
+    struct WSAData wsa_data;
+    int r = WSAStartup(MAKEWORD(2, 2), &wsa_data);
+    ASSERT_OK(r);
+#endif
+}
+
+
+static uv_os_sock_t create_tcp_socket(void) {
+  uv_os_sock_t sock;
+
+  sock = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
+#ifdef _WIN32
+  ASSERT_NE(sock, INVALID_SOCKET);
+#else
+  ASSERT_GE(sock, 0);
+#endif
+
+#ifndef _WIN32
+  {
+    /* Allow reuse of the port. */
+    int yes = 1;
+    int r = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes);
+    ASSERT_OK(r);
+  }
+#endif
+
+  return sock;
+}
+
+
+static void close_socket(uv_os_sock_t sock) {
+  int r;
+#ifdef _WIN32
+  r = closesocket(sock);
+#else
+  r = close(sock);
+#endif
+  ASSERT_OK(r);
+}
+
+
+static void alloc_cb(uv_handle_t* handle,
+                     size_t suggested_size,
+                     uv_buf_t* buf) {
+  static char slab[65536];
+  ASSERT_LE(suggested_size, sizeof(slab));
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+
+static void close_cb(uv_handle_t* handle) {
+  ASSERT_NOT_NULL(handle);
+  close_cb_called++;
+}
+
+
+static void shutdown_cb(uv_shutdown_t* req, int status) {
+  ASSERT_PTR_EQ(req, &shutdown_req);
+  ASSERT_OK(status);
+
+  /* Now we wait for the EOF */
+  shutdown_cb_called++;
+}
+
+
+static void read_cb(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* buf) {
+  ASSERT_NOT_NULL(tcp);
+
+  if (nread >= 0) {
+    ASSERT_EQ(4, nread);
+    ASSERT_OK(memcmp("PING", buf->base, nread));
+  }
+  else {
+    ASSERT_EQ(nread, UV_EOF);
+    uv_close((uv_handle_t*)tcp, close_cb);
+  }
+}
+
+
+static void read1_cb(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* buf) {
+  int i;
+  ASSERT_NOT_NULL(tcp);
+
+  if (nread >= 0) {
+    for (i = 0; i < nread; ++i)
+      ASSERT_EQ(buf->base[i], 'P');
+  } else {
+    ASSERT_EQ(nread, UV_EOF);
+    printf("GOT EOF\n");
+    uv_close((uv_handle_t*)tcp, close_cb);
+  }
+}
+
+
+static void write_cb(uv_write_t* req, int status) {
+  ASSERT_NOT_NULL(req);
+
+  if (status) {
+    fprintf(stderr, "uv_write error: %s\n", uv_strerror(status));
+    ASSERT(0);
+  }
+
+  write_cb_called++;
+}
+
+
+static void write1_cb(uv_write_t* req, int status) {
+  uv_buf_t buf;
+  int r;
+
+  ASSERT_NOT_NULL(req);
+  if (status) {
+    ASSERT(shutdown_cb_called);
+    return;
+  }
+
+  if (shutdown_requested)
+    return;
+
+  buf = uv_buf_init("P", 1);
+  r = uv_write(&write_req, req->handle, &buf, 1, write1_cb);
+  ASSERT_OK(r);
+
+  write_cb_called++;
+}
+
+
+static void timer_cb(uv_timer_t* handle) {
+  int r;
+
+  /* Shutdown on drain. */
+  r = uv_shutdown(&shutdown_req, (uv_stream_t*) &client, shutdown_cb);
+  ASSERT_OK(r);
+  shutdown_requested++;
+}
+
+
+static void connect_cb(uv_connect_t* req, int status) {
+  uv_buf_t buf = uv_buf_init("PING", 4);
+  uv_stream_t* stream;
+  int r;
+
+  ASSERT_PTR_EQ(req, &connect_req);
+  ASSERT_OK(status);
+
+  stream = req->handle;
+  connect_cb_called++;
+
+  r = uv_write(&write_req, stream, &buf, 1, write_cb);
+  ASSERT_OK(r);
+
+  /* Shutdown on drain. */
+  r = uv_shutdown(&shutdown_req, stream, shutdown_cb);
+  ASSERT_OK(r);
+
+  /* Start reading */
+  r = uv_read_start(stream, alloc_cb, read_cb);
+  ASSERT_OK(r);
+}
+
+
+static void connect1_cb(uv_connect_t* req, int status) {
+  uv_buf_t buf;
+  uv_stream_t* stream;
+  int r;
+
+  ASSERT_PTR_EQ(req, &connect_req);
+  ASSERT_OK(status);
+
+  stream = req->handle;
+  connect_cb_called++;
+
+  r = uv_timer_init(uv_default_loop(), &tm);
+  ASSERT_OK(r);
+
+  r = uv_timer_start(&tm, timer_cb, 2000, 0);
+  ASSERT_OK(r);
+
+  buf = uv_buf_init("P", 1);
+  r = uv_write(&write_req, stream, &buf, 1, write1_cb);
+  ASSERT_OK(r);
+
+  /* Start reading */
+  r = uv_read_start(stream, alloc_cb, read1_cb);
+  ASSERT_OK(r);
+}
+
+
+TEST_IMPL(tcp_open) {
+  struct sockaddr_in addr;
+  uv_os_sock_t sock;
+  int r;
+  uv_tcp_t client2;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  startup();
+  sock = create_tcp_socket();
+
+  r = uv_tcp_init(uv_default_loop(), &client);
+  ASSERT_OK(r);
+
+  r = uv_tcp_open(&client, sock);
+  ASSERT_OK(r);
+
+  r = uv_tcp_connect(&connect_req,
+                     &client,
+                     (const struct sockaddr*) &addr,
+                     connect_cb);
+  ASSERT_OK(r);
+
+#ifndef _WIN32
+  {
+    r = uv_tcp_init(uv_default_loop(), &client2);
+    ASSERT_OK(r);
+
+    r = uv_tcp_open(&client2, sock);
+    ASSERT_EQ(r, UV_EEXIST);
+
+    uv_close((uv_handle_t*) &client2, NULL);
+  }
+#else  /* _WIN32 */
+  (void)client2;
+#endif
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_EQ(1, shutdown_cb_called);
+  ASSERT_EQ(1, connect_cb_called);
+  ASSERT_EQ(1, write_cb_called);
+  ASSERT_EQ(1, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(tcp_open_twice) {
+  uv_tcp_t client;
+  uv_os_sock_t sock1, sock2;
+  int r;
+
+  startup();
+  sock1 = create_tcp_socket();
+  sock2 = create_tcp_socket();
+
+  r = uv_tcp_init(uv_default_loop(), &client);
+  ASSERT_OK(r);
+
+  r = uv_tcp_open(&client, sock1);
+  ASSERT_OK(r);
+
+  r = uv_tcp_open(&client, sock2);
+  ASSERT_EQ(r, UV_EBUSY);
+  close_socket(sock2);
+
+  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_open_bound) {
+  struct sockaddr_in addr;
+  uv_tcp_t server;
+  uv_os_sock_t sock;
+
+  startup();
+  sock = create_tcp_socket();
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  ASSERT_OK(uv_tcp_init(uv_default_loop(), &server));
+
+  ASSERT_OK(bind(sock, (struct sockaddr*) &addr, sizeof(addr)));
+
+  ASSERT_OK(uv_tcp_open(&server, sock));
+
+  ASSERT_OK(uv_listen((uv_stream_t*) &server, 128, NULL));
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(tcp_open_connected) {
+  struct sockaddr_in addr;
+  uv_tcp_t client;
+  uv_os_sock_t sock;
+  uv_buf_t buf = uv_buf_init("PING", 4);
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  startup();
+  sock = create_tcp_socket();
+
+  ASSERT_OK(connect(sock, (struct sockaddr*) &addr,  sizeof(addr)));
+
+  ASSERT_OK(uv_tcp_init(uv_default_loop(), &client));
+
+  ASSERT_OK(uv_tcp_open(&client, sock));
+
+  ASSERT_OK(uv_write(&write_req,
+                     (uv_stream_t*) &client,
+                     &buf,
+                     1,
+                     write_cb));
+
+  ASSERT_OK(uv_shutdown(&shutdown_req,
+                        (uv_stream_t*) &client,
+                        shutdown_cb));
+
+  ASSERT_OK(uv_read_start((uv_stream_t*) &client, alloc_cb, read_cb));
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_EQ(1, shutdown_cb_called);
+  ASSERT_EQ(1, write_cb_called);
+  ASSERT_EQ(1, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(tcp_write_ready) {
+  struct sockaddr_in addr;
+  uv_os_sock_t sock;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  startup();
+  sock = create_tcp_socket();
+
+  r = uv_tcp_init(uv_default_loop(), &client);
+  ASSERT_OK(r);
+
+  r = uv_tcp_open(&client, sock);
+  ASSERT_OK(r);
+
+  r = uv_tcp_connect(&connect_req,
+                     &client,
+                     (const struct sockaddr*) &addr,
+                     connect1_cb);
+  ASSERT_OK(r);
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_EQ(1, shutdown_cb_called);
+  ASSERT_EQ(1, shutdown_requested);
+  ASSERT_EQ(1, connect_cb_called);
+  ASSERT_GT(write_cb_called, 0);
+  ASSERT_EQ(1, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}