--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-readable-on-eof.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,110 @@
+/* Copyright the 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"
+
+static uv_loop_t loop;
+static uv_tcp_t tcp_client;
+static uv_connect_t connect_req;
+static uv_write_t write_req;
+static char close_me_cmd[] = {'Q', 'S'};
+
+static int connect_cb_called;
+static int read_cb_called;
+static int write_cb_called;
+static int close_cb_called;
+
+static void write_cb(uv_write_t* req, int status) {
+  write_cb_called++;
+  ASSERT_OK(status);
+}
+
+static void alloc_cb(uv_handle_t* handle,
+                     size_t suggested_size,
+                     uv_buf_t* buf) {
+  static char slab[64];
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+static void close_cb(uv_handle_t* handle) {
+  close_cb_called++;
+}
+
+static void read_cb(uv_stream_t* handle, ssize_t nread, const uv_buf_t* buf) {
+  int r;
+
+  ASSERT_EQ(nread, UV_EOF);
+  ASSERT_EQ(1, uv_is_readable(handle));
+  ASSERT_EQ(1, uv_is_writable(handle));
+
+  if (++read_cb_called == 3) {
+      uv_close((uv_handle_t*) handle, close_cb);
+      ASSERT_OK(uv_is_readable(handle));
+      ASSERT_OK(uv_is_writable(handle));
+  } else {
+      r = uv_read_start((uv_stream_t*) &tcp_client, alloc_cb, read_cb);
+      ASSERT_OK(r);
+  }
+}
+
+static void connect_cb(uv_connect_t* req, int status) {
+  int r;
+  uv_buf_t close_me;
+
+  connect_cb_called++;
+  ASSERT_OK(status);
+
+  read_cb((uv_stream_t*) &tcp_client, UV_EOF, NULL);
+
+  close_me = uv_buf_init(close_me_cmd, sizeof(close_me_cmd));
+
+  r = uv_write(&write_req,
+               (uv_stream_t*) &tcp_client,
+               &close_me,
+               1,
+               write_cb);
+
+  ASSERT_OK(r);
+}
+
+TEST_IMPL(readable_on_eof) {
+  struct sockaddr_in sa;
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &sa));
+  ASSERT_OK(uv_loop_init(&loop));
+  ASSERT_OK(uv_tcp_init(&loop, &tcp_client));
+
+  ASSERT_OK(uv_tcp_connect(&connect_req,
+                           &tcp_client,
+                           (const struct sockaddr*) &sa,
+                           connect_cb));
+
+  ASSERT_OK(uv_run(&loop, UV_RUN_DEFAULT));
+
+  ASSERT_EQ(1, connect_cb_called);
+  ASSERT_EQ(3, read_cb_called);
+  ASSERT_EQ(1, write_cb_called);
+  ASSERT_EQ(1, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(&loop);
+  return 0;
+}