--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-handle-fileno.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,125 @@
+/* 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"
+
+
+static int get_tty_fd(void) {
+  /* Make sure we have an FD that refers to a tty */
+#ifdef _WIN32
+  HANDLE handle;
+  handle = CreateFileA("conin$",
+                       GENERIC_READ | GENERIC_WRITE,
+                       FILE_SHARE_READ | FILE_SHARE_WRITE,
+                       NULL,
+                       OPEN_EXISTING,
+                       FILE_ATTRIBUTE_NORMAL,
+                       NULL);
+  if (handle == INVALID_HANDLE_VALUE)
+    return -1;
+  return _open_osfhandle((intptr_t) handle, 0);
+#else /* unix */
+  return open("/dev/tty", O_RDONLY, 0);
+#endif
+}
+
+
+TEST_IMPL(handle_fileno) {
+  int r;
+  int tty_fd;
+  struct sockaddr_in addr;
+  uv_os_fd_t fd;
+  uv_tcp_t tcp;
+  uv_udp_t udp;
+  uv_pipe_t pipe;
+  uv_tty_t tty;
+  uv_idle_t idle;
+  uv_loop_t* loop;
+
+  loop = uv_default_loop();
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  r = uv_idle_init(loop, &idle);
+  ASSERT_OK(r);
+  r = uv_fileno((uv_handle_t*) &idle, &fd);
+  ASSERT_EQ(r, UV_EINVAL);
+  uv_close((uv_handle_t*) &idle, NULL);
+
+  r = uv_tcp_init(loop, &tcp);
+  ASSERT_OK(r);
+  r = uv_fileno((uv_handle_t*) &tcp, &fd);
+  ASSERT_EQ(r, UV_EBADF);
+  r = uv_tcp_bind(&tcp, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+  r = uv_fileno((uv_handle_t*) &tcp, &fd);
+  ASSERT_OK(r);
+  uv_close((uv_handle_t*) &tcp, NULL);
+  r = uv_fileno((uv_handle_t*) &tcp, &fd);
+  ASSERT_EQ(r, UV_EBADF);
+
+  r = uv_udp_init(loop, &udp);
+  ASSERT_OK(r);
+  r = uv_fileno((uv_handle_t*) &udp, &fd);
+  ASSERT_EQ(r, UV_EBADF);
+  r = uv_udp_bind(&udp, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+  r = uv_fileno((uv_handle_t*) &udp, &fd);
+  ASSERT_OK(r);
+  uv_close((uv_handle_t*) &udp, NULL);
+  r = uv_fileno((uv_handle_t*) &udp, &fd);
+  ASSERT_EQ(r, UV_EBADF);
+
+  r = uv_pipe_init(loop, &pipe, 0);
+  ASSERT_OK(r);
+  r = uv_fileno((uv_handle_t*) &pipe, &fd);
+  ASSERT_EQ(r, UV_EBADF);
+  r = uv_pipe_bind(&pipe, TEST_PIPENAME);
+  ASSERT_OK(r);
+  r = uv_fileno((uv_handle_t*) &pipe, &fd);
+  ASSERT_OK(r);
+  uv_close((uv_handle_t*) &pipe, NULL);
+  r = uv_fileno((uv_handle_t*) &pipe, &fd);
+  ASSERT_EQ(r, UV_EBADF);
+
+  tty_fd = get_tty_fd();
+  if (tty_fd < 0) {
+    fprintf(stderr, "Cannot open a TTY fd");
+    fflush(stderr);
+  } else {
+    r = uv_tty_init(loop, &tty, tty_fd, 0);
+    ASSERT_OK(r);
+    ASSERT(uv_is_readable((uv_stream_t*) &tty));
+    ASSERT(!uv_is_writable((uv_stream_t*) &tty));
+    r = uv_fileno((uv_handle_t*) &tty, &fd);
+    ASSERT_OK(r);
+    uv_close((uv_handle_t*) &tty, NULL);
+    r = uv_fileno((uv_handle_t*) &tty, &fd);
+    ASSERT_EQ(r, UV_EBADF);
+    ASSERT(!uv_is_readable((uv_stream_t*) &tty));
+    ASSERT(!uv_is_writable((uv_stream_t*) &tty));
+  }
+
+  uv_run(loop, UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}