--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-tcp-close-reset.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,340 @@
+/* Copyright libuv project 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 <errno.h>
+#include <string.h> /* memset */
+
+#ifdef _WIN32
+# define INVALID_FD (INVALID_HANDLE_VALUE)
+#else
+# define INVALID_FD (-1)
+#endif
+
+static uv_loop_t* loop;
+static uv_tcp_t tcp_server;
+static uv_tcp_t tcp_client;
+static uv_tcp_t tcp_accepted;
+static uv_connect_t connect_req;
+static uv_shutdown_t shutdown_req;
+static uv_write_t write_reqs[4];
+
+static int client_close;
+static int shutdown_before_close;
+
+static int write_cb_called;
+static int close_cb_called;
+static int shutdown_cb_called;
+
+static void connect_cb(uv_connect_t* req, int status);
+static void write_cb(uv_write_t* req, int status);
+static void close_cb(uv_handle_t* handle);
+static void shutdown_cb(uv_shutdown_t* req, int status);
+
+static int read_size;
+
+
+static void do_write(uv_tcp_t* handle) {
+  uv_buf_t buf;
+  unsigned i;
+  int r;
+
+  buf = uv_buf_init("PING", 4);
+  for (i = 0; i < ARRAY_SIZE(write_reqs); i++) {
+    r = uv_write(&write_reqs[i], (uv_stream_t*) handle, &buf, 1, write_cb);
+    ASSERT_OK(r);
+  }
+}
+
+
+static void do_close(uv_tcp_t* handle) {
+  uv_os_fd_t fd;
+  int r;
+
+  if (shutdown_before_close == 1) {
+    ASSERT_OK(uv_shutdown(&shutdown_req,
+                          (uv_stream_t*) handle,
+                          shutdown_cb));
+    ASSERT_EQ(UV_EINVAL, uv_tcp_close_reset(handle, close_cb));
+  } else if (shutdown_before_close == 2) {
+    r = uv_fileno((const uv_handle_t*) handle, &fd);
+    ASSERT_OK(r);
+#ifdef _WIN32
+    ASSERT_PTR_NE(fd, INVALID_FD);
+    ASSERT_OK(shutdown((SOCKET)fd, SD_BOTH));
+#else
+    ASSERT_NE(fd, INVALID_FD);
+    ASSERT_OK(shutdown(fd, SHUT_RDWR));
+#endif
+    ASSERT_OK(uv_tcp_close_reset(handle, close_cb));
+  } else {
+    ASSERT_OK(uv_tcp_close_reset(handle, close_cb));
+    ASSERT_EQ(UV_ENOTCONN, uv_shutdown(&shutdown_req, (uv_stream_t*) handle,
+              shutdown_cb));
+  }
+
+  uv_close((uv_handle_t*) &tcp_server, NULL);
+}
+
+static void alloc_cb(uv_handle_t* handle, size_t size, uv_buf_t* buf) {
+  static char slab[1024];
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+static void read_cb2(uv_stream_t* stream, ssize_t nread, const uv_buf_t* buf) {
+  ASSERT_PTR_EQ((uv_tcp_t*)stream, &tcp_client);
+  if (nread == UV_EOF)
+    uv_close((uv_handle_t*) stream, NULL);
+}
+
+
+static void connect_cb(uv_connect_t* conn_req, int status) {
+  ASSERT_PTR_EQ(conn_req, &connect_req);
+  uv_read_start((uv_stream_t*) &tcp_client, alloc_cb, read_cb2);
+  do_write(&tcp_client);
+  if (client_close)
+    do_close(&tcp_client);
+}
+
+
+static void write_cb(uv_write_t* req, int status) {
+  /* write callbacks should run before the close callback */
+  ASSERT_OK(close_cb_called);
+  ASSERT_PTR_EQ(req->handle, (uv_stream_t*)&tcp_client);
+  write_cb_called++;
+}
+
+
+static void close_cb(uv_handle_t* handle) {
+  if (client_close)
+    ASSERT_PTR_EQ(handle, (uv_handle_t*) &tcp_client);
+  else
+    ASSERT_PTR_EQ(handle, (uv_handle_t*) &tcp_accepted);
+
+  close_cb_called++;
+}
+
+static void shutdown_cb(uv_shutdown_t* req, int status) {
+  if (client_close)
+    ASSERT_PTR_EQ(req->handle, (uv_stream_t*) &tcp_client);
+  else
+    ASSERT_PTR_EQ(req->handle, (uv_stream_t*) &tcp_accepted);
+
+  shutdown_cb_called++;
+}
+
+
+static void read_cb(uv_stream_t* stream, ssize_t nread, const uv_buf_t* buf) {
+  ASSERT_PTR_EQ((uv_tcp_t*)stream, &tcp_accepted);
+  if (nread < 0) {
+    uv_close((uv_handle_t*) stream, NULL);
+  } else {
+    read_size += nread;
+    if (read_size == 16 && client_close == 0)
+      do_close(&tcp_accepted);
+  }
+}
+
+
+static void connection_cb(uv_stream_t* server, int status) {
+  ASSERT_OK(status);
+
+  ASSERT_OK(uv_tcp_init(loop, &tcp_accepted));
+  ASSERT_OK(uv_accept(server, (uv_stream_t*) &tcp_accepted));
+
+  uv_read_start((uv_stream_t*) &tcp_accepted, alloc_cb, read_cb);
+}
+
+
+static void start_server(uv_loop_t* loop, uv_tcp_t* handle) {
+  struct sockaddr_in addr;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  r = uv_tcp_init(loop, handle);
+  ASSERT_OK(r);
+
+  r = uv_tcp_bind(handle, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  r = uv_listen((uv_stream_t*)handle, 128, connection_cb);
+  ASSERT_OK(r);
+}
+
+
+static void do_connect(uv_loop_t* loop, uv_tcp_t* tcp_client) {
+  struct sockaddr_in addr;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  r = uv_tcp_init(loop, tcp_client);
+  ASSERT_OK(r);
+
+  r = uv_tcp_connect(&connect_req,
+                     tcp_client,
+                     (const struct sockaddr*) &addr,
+                     connect_cb);
+  ASSERT_OK(r);
+}
+
+
+/* Check that pending write requests have their callbacks
+ * invoked when the handle is closed.
+ */
+TEST_IMPL(tcp_close_reset_client) {
+  int r;
+
+  loop = uv_default_loop();
+
+  start_server(loop, &tcp_server);
+
+  client_close = 1;
+  shutdown_before_close = 0;
+
+  do_connect(loop, &tcp_client);
+
+  ASSERT_OK(write_cb_called);
+  ASSERT_OK(close_cb_called);
+  ASSERT_OK(shutdown_cb_called);
+
+  r = uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  ASSERT_EQ(4, write_cb_called);
+  ASSERT_EQ(1, close_cb_called);
+  ASSERT_OK(shutdown_cb_called);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+TEST_IMPL(tcp_close_reset_client_after_shutdown) {
+  int r;
+
+  loop = uv_default_loop();
+
+  start_server(loop, &tcp_server);
+
+  client_close = 1;
+  shutdown_before_close = 1;
+
+  do_connect(loop, &tcp_client);
+
+  ASSERT_OK(write_cb_called);
+  ASSERT_OK(close_cb_called);
+  ASSERT_OK(shutdown_cb_called);
+
+  r = uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  ASSERT_EQ(4, write_cb_called);
+  ASSERT_OK(close_cb_called);
+  ASSERT_EQ(1, shutdown_cb_called);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+TEST_IMPL(tcp_close_reset_accepted) {
+  int r;
+
+  loop = uv_default_loop();
+
+  start_server(loop, &tcp_server);
+
+  client_close = 0;
+  shutdown_before_close = 0;
+
+  do_connect(loop, &tcp_client);
+
+  ASSERT_OK(write_cb_called);
+  ASSERT_OK(close_cb_called);
+  ASSERT_OK(shutdown_cb_called);
+
+  r = uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  ASSERT_EQ(4, write_cb_called);
+  ASSERT_EQ(1, close_cb_called);
+  ASSERT_OK(shutdown_cb_called);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+TEST_IMPL(tcp_close_reset_accepted_after_shutdown) {
+  int r;
+
+  loop = uv_default_loop();
+
+  start_server(loop, &tcp_server);
+
+  client_close = 0;
+  shutdown_before_close = 1;
+
+  do_connect(loop, &tcp_client);
+
+  ASSERT_OK(write_cb_called);
+  ASSERT_OK(close_cb_called);
+  ASSERT_OK(shutdown_cb_called);
+
+  r = uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  ASSERT_EQ(4, write_cb_called);
+  ASSERT_OK(close_cb_called);
+  ASSERT_EQ(1, shutdown_cb_called);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+TEST_IMPL(tcp_close_reset_accepted_after_socket_shutdown) {
+  int r;
+
+  loop = uv_default_loop();
+
+  start_server(loop, &tcp_server);
+
+  client_close = 0;
+  shutdown_before_close = 2;
+
+  do_connect(loop, &tcp_client);
+
+  ASSERT_OK(write_cb_called);
+  ASSERT_OK(close_cb_called);
+  ASSERT_OK(shutdown_cb_called);
+
+  r = uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  ASSERT_EQ(4, write_cb_called);
+  ASSERT_EQ(1, close_cb_called);
+  ASSERT_OK(shutdown_cb_called);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}