--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-ip4-addr.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,55 @@
+/* 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 <string.h>
+
+
+TEST_IMPL(ip4_addr) {
+  struct sockaddr_in addr;
+  char dst[16];
+
+  ASSERT_OK(uv_inet_ntop(AF_INET, "\xFF\xFF\xFF\xFF", dst, sizeof(dst)));
+  ASSERT_OK(strcmp(dst, "255.255.255.255"));
+  ASSERT_EQ(UV_ENOSPC, uv_inet_ntop(AF_INET, "\xFF\xFF\xFF\xFF",
+                                    dst, sizeof(dst) - 1));
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+  ASSERT_OK(uv_ip4_addr("255.255.255.255", TEST_PORT, &addr));
+  ASSERT_EQ(UV_EINVAL, uv_ip4_addr("255.255.255*000", TEST_PORT, &addr));
+  ASSERT_EQ(UV_EINVAL, uv_ip4_addr("255.255.255.256", TEST_PORT, &addr));
+  ASSERT_EQ(UV_EINVAL, uv_ip4_addr("2555.0.0.0", TEST_PORT, &addr));
+  ASSERT_EQ(UV_EINVAL, uv_ip4_addr("255", TEST_PORT, &addr));
+
+#ifdef SIN6_LEN
+  ASSERT_EQ(addr.sin_len, sizeof(addr));
+#endif
+
+  /* for broken address family */
+  ASSERT_EQ(UV_EAFNOSUPPORT, uv_inet_pton(42, "127.0.0.1",
+                                          &addr.sin_addr.s_addr));
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}