--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-tcp-close-accept.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,198 @@
+/* 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.
+ */
+
+/* this test is Unix only */
+#ifndef _WIN32
+
+#include "uv.h"
+#include "task.h"
+
+#include <stdio.h>
+#include <string.h>
+
+static struct sockaddr_in addr;
+static uv_tcp_t tcp_server;
+static uv_tcp_t tcp_outgoing[2];
+static uv_tcp_t tcp_incoming[ARRAY_SIZE(tcp_outgoing)];
+static uv_connect_t connect_reqs[ARRAY_SIZE(tcp_outgoing)];
+static uv_tcp_t tcp_check;
+static uv_connect_t tcp_check_req;
+static uv_write_t write_reqs[ARRAY_SIZE(tcp_outgoing)];
+static unsigned int got_connections;
+static unsigned int close_cb_called;
+static unsigned int write_cb_called;
+static unsigned int read_cb_called;
+static unsigned int pending_incoming;
+
+static void close_cb(uv_handle_t* handle) {
+  close_cb_called++;
+}
+
+static void write_cb(uv_write_t* req, int status) {
+  ASSERT_OK(status);
+  write_cb_called++;
+}
+
+static void connect_cb(uv_connect_t* req, int status) {
+  unsigned int i;
+  uv_buf_t buf;
+  uv_stream_t* outgoing;
+
+  if (req == &tcp_check_req) {
+    ASSERT(status);
+
+    /*
+     * Time to finish the test: close both the check and pending incoming
+     * connections
+     */
+    uv_close((uv_handle_t*) &tcp_incoming[pending_incoming], close_cb);
+    uv_close((uv_handle_t*) &tcp_check, close_cb);
+    return;
+  }
+
+  ASSERT_OK(status);
+  ASSERT_LE(connect_reqs, req);
+  ASSERT_LE(req, connect_reqs + ARRAY_SIZE(connect_reqs));
+  i = req - connect_reqs;
+
+  buf = uv_buf_init("x", 1);
+  outgoing = (uv_stream_t*) &tcp_outgoing[i];
+  ASSERT_OK(uv_write(&write_reqs[i], outgoing, &buf, 1, write_cb));
+}
+
+static void alloc_cb(uv_handle_t* handle, size_t size, uv_buf_t* buf) {
+  static char slab[1];
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+static void read_cb(uv_stream_t* stream, ssize_t nread, const uv_buf_t* buf) {
+  uv_loop_t* loop;
+  unsigned int i;
+
+  pending_incoming = (uv_tcp_t*) stream - &tcp_incoming[0];
+  ASSERT_LT(pending_incoming, got_connections);
+  ASSERT_OK(uv_read_stop(stream));
+  ASSERT_EQ(1, nread);
+
+  loop = stream->loop;
+  read_cb_called++;
+
+  /* Close all active incomings, except current one */
+  for (i = 0; i < got_connections; i++) {
+    if (i != pending_incoming)
+      uv_close((uv_handle_t*) &tcp_incoming[i], close_cb);
+  }
+
+  /* Close server, so no one will connect to it */
+  uv_close((uv_handle_t*) &tcp_server, close_cb);
+
+  /* Create new fd that should be one of the closed incomings */
+  ASSERT_OK(uv_tcp_init(loop, &tcp_check));
+  ASSERT_OK(uv_tcp_connect(&tcp_check_req,
+                           &tcp_check,
+                           (const struct sockaddr*) &addr,
+                           connect_cb));
+  ASSERT_OK(uv_read_start((uv_stream_t*) &tcp_check, alloc_cb, read_cb));
+}
+
+static void connection_cb(uv_stream_t* server, int status) {
+  unsigned int i;
+  uv_tcp_t* incoming;
+
+  ASSERT_PTR_EQ(server, (uv_stream_t*) &tcp_server);
+
+  /* Ignore tcp_check connection */
+  if (got_connections == ARRAY_SIZE(tcp_incoming))
+    return;
+
+  /* Accept everyone */
+  incoming = &tcp_incoming[got_connections++];
+  ASSERT_OK(uv_tcp_init(server->loop, incoming));
+  ASSERT_OK(uv_accept(server, (uv_stream_t*) incoming));
+
+  if (got_connections != ARRAY_SIZE(tcp_incoming))
+    return;
+
+  /* Once all clients are accepted - start reading */
+  for (i = 0; i < ARRAY_SIZE(tcp_incoming); i++) {
+    incoming = &tcp_incoming[i];
+    ASSERT_OK(uv_read_start((uv_stream_t*) incoming, alloc_cb, read_cb));
+  }
+}
+
+TEST_IMPL(tcp_close_accept) {
+  unsigned int i;
+  uv_loop_t* loop;
+  uv_tcp_t* client;
+
+  /*
+   * A little explanation of what goes on below:
+   *
+   * We'll create server and connect to it using two clients, each writing one
+   * byte once connected.
+   *
+   * When all clients will be accepted by server - we'll start reading from them
+   * and, on first client's first byte, will close second client and server.
+   * After that, we'll immediately initiate new connection to server using
+   * tcp_check handle (thus, reusing fd from second client).
+   *
+   * In this situation uv__io_poll()'s event list should still contain read
+   * event for second client, and, if not cleaned up properly, `tcp_check` will
+   * receive stale event of second incoming and invoke `connect_cb` with zero
+   * status.
+   */
+
+  loop = uv_default_loop();
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  ASSERT_OK(uv_tcp_init(loop, &tcp_server));
+  ASSERT_OK(uv_tcp_bind(&tcp_server, (const struct sockaddr*) &addr, 0));
+  ASSERT_OK(uv_listen((uv_stream_t*) &tcp_server,
+                      ARRAY_SIZE(tcp_outgoing),
+                      connection_cb));
+
+  for (i = 0; i < ARRAY_SIZE(tcp_outgoing); i++) {
+    client = tcp_outgoing + i;
+
+    ASSERT_OK(uv_tcp_init(loop, client));
+    ASSERT_OK(uv_tcp_connect(&connect_reqs[i],
+                             client,
+                             (const struct sockaddr*) &addr,
+                             connect_cb));
+  }
+
+  uv_run(loop, UV_RUN_DEFAULT);
+
+  ASSERT_EQ(ARRAY_SIZE(tcp_outgoing), got_connections);
+  ASSERT_EQ((ARRAY_SIZE(tcp_outgoing) + 2), close_cb_called);
+  ASSERT_EQ(ARRAY_SIZE(tcp_outgoing), write_cb_called);
+  ASSERT_EQ(1, read_cb_called);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+#else
+
+typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
+
+#endif /* !_WIN32 */