--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-walk-handles.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,77 @@
+/* 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>
+
+static char magic_cookie[] = "magic cookie";
+static int seen_timer_handle;
+static uv_timer_t timer;
+
+
+static void walk_cb(uv_handle_t* handle, void* arg) {
+  ASSERT_PTR_EQ(arg, (void*)magic_cookie);
+
+  if (handle == (uv_handle_t*)&timer) {
+    seen_timer_handle++;
+  } else {
+    ASSERT(0 && "unexpected handle");
+  }
+}
+
+
+static void timer_cb(uv_timer_t* handle) {
+  ASSERT_PTR_EQ(handle, &timer);
+
+  uv_walk(handle->loop, walk_cb, magic_cookie);
+  uv_close((uv_handle_t*)handle, NULL);
+}
+
+
+TEST_IMPL(walk_handles) {
+  uv_loop_t* loop;
+  int r;
+
+  loop = uv_default_loop();
+
+  r = uv_timer_init(loop, &timer);
+  ASSERT_OK(r);
+
+  r = uv_timer_start(&timer, timer_cb, 1, 0);
+  ASSERT_OK(r);
+
+  /* Start event loop, expect to see the timer handle in walk_cb. */
+  ASSERT_OK(seen_timer_handle);
+  r = uv_run(loop, UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+  ASSERT_EQ(1, seen_timer_handle);
+
+  /* Loop is finished, walk_cb should not see our timer handle. */
+  seen_timer_handle = 0;
+  uv_walk(loop, walk_cb, magic_cookie);
+  ASSERT_OK(seen_timer_handle);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}