--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-ip6-addr.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,175 @@
+/* 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>
+
+#ifdef __linux__
+# include <sys/socket.h>
+# include <net/if.h>
+#endif
+
+
+TEST_IMPL(ip6_addr_link_local) {
+#if defined(__CYGWIN__) || defined(__MSYS__)
+  /* FIXME: Does Cygwin support this?  */
+  RETURN_SKIP("FIXME: This test needs more investigation on Cygwin");
+#endif
+  char string_address[INET6_ADDRSTRLEN];
+  uv_interface_address_t* addresses;
+  uv_interface_address_t* address;
+  struct sockaddr_in6 addr;
+  unsigned int iface_index;
+  const char* device_name;
+  /* 40 bytes address, 16 bytes device name, plus reserve. */
+  char scoped_addr[128];
+  size_t scoped_addr_len;
+  char interface_id[UV_IF_NAMESIZE];
+  size_t interface_id_len;
+  int count;
+  int ix;
+  int r;
+
+  ASSERT_OK(uv_interface_addresses(&addresses, &count));
+
+  for (ix = 0; ix < count; ix++) {
+    address = addresses + ix;
+
+    if (address->address.address6.sin6_family != AF_INET6)
+      continue;
+
+    ASSERT_OK(uv_inet_ntop(AF_INET6,
+                           &address->address.address6.sin6_addr,
+                           string_address,
+                           sizeof(string_address)));
+
+    /* Skip addresses that are not link-local. */
+    if (strncmp(string_address, "fe80::", 6) != 0)
+      continue;
+
+    iface_index = address->address.address6.sin6_scope_id;
+    device_name = address->name;
+
+    scoped_addr_len = sizeof(scoped_addr);
+    ASSERT_OK(uv_if_indextoname(iface_index,
+                                scoped_addr,
+                                &scoped_addr_len));
+#ifndef _WIN32
+    /* This assert fails on Windows, as Windows semantics are different. */
+    ASSERT_OK(strcmp(device_name, scoped_addr));
+#endif
+
+    interface_id_len = sizeof(interface_id);
+    r = uv_if_indextoiid(iface_index, interface_id, &interface_id_len);
+    ASSERT_OK(r);
+#ifdef _WIN32
+    /* On Windows, the interface identifier is the numeric string of the index. */
+    ASSERT_EQ(strtoul(interface_id, NULL, 10), iface_index);
+#else
+    /* On Unix/Linux, the interface identifier is the interface device name. */
+    ASSERT_OK(strcmp(device_name, interface_id));
+#endif
+
+    snprintf(scoped_addr,
+             sizeof(scoped_addr),
+             "%s%%%s",
+             string_address,
+             interface_id);
+
+    fprintf(stderr, "Testing link-local address %s "
+            "(iface_index: 0x%02x, device_name: %s)\n",
+            scoped_addr,
+            iface_index,
+            device_name);
+    fflush(stderr);
+
+    ASSERT_OK(uv_ip6_addr(scoped_addr, TEST_PORT, &addr));
+    fprintf(stderr, "Got scope_id 0x%2x\n", (unsigned)addr.sin6_scope_id);
+    fflush(stderr);
+    ASSERT_EQ(iface_index, addr.sin6_scope_id);
+  }
+
+  uv_free_interface_addresses(addresses, count);
+
+  scoped_addr_len = sizeof(scoped_addr);
+  ASSERT_NE(0, uv_if_indextoname((unsigned int)-1,
+                                 scoped_addr,
+                                 &scoped_addr_len));
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+#define GOOD_ADDR_LIST(X)                                                     \
+    X("::")                                                                   \
+    X("::1")                                                                  \
+    X("fe80::1")                                                              \
+    X("fe80::")                                                               \
+    X("fe80::2acf:daff:fedd:342a")                                            \
+    X("fe80:0:0:0:2acf:daff:fedd:342a")                                       \
+    X("fe80:0:0:0:2acf:daff:1.2.3.4")                                         \
+    X("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")                        \
+
+#define BAD_ADDR_LIST(X)                                                      \
+    X(":::1")                                                                 \
+    X("abcde::1")                                                             \
+    X("fe80:0:0:0:2acf:daff:fedd:342a:5678")                                  \
+    X("fe80:0:0:0:2acf:daff:abcd:1.2.3.4")                                    \
+    X("fe80:0:0:2acf:daff:1.2.3.4.5")                                         \
+    X("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255.255")                    \
+
+#define TEST_GOOD(ADDR)                                                       \
+    ASSERT_OK(uv_inet_pton(AF_INET6, ADDR, &addr));                           \
+    ASSERT_OK(uv_inet_pton(AF_INET6, ADDR "%en1", &addr));                    \
+    ASSERT_OK(uv_inet_pton(AF_INET6, ADDR "%%%%", &addr));                    \
+    ASSERT_OK(uv_inet_pton(AF_INET6, ADDR "%en1:1.2.3.4", &addr));            \
+
+#define TEST_BAD(ADDR)                                                        \
+    ASSERT_NE(0, uv_inet_pton(AF_INET6, ADDR, &addr));                        \
+    ASSERT_NE(0, uv_inet_pton(AF_INET6, ADDR "%en1", &addr));                 \
+    ASSERT_NE(0, uv_inet_pton(AF_INET6, ADDR "%%%%", &addr));                 \
+    ASSERT_NE(0, uv_inet_pton(AF_INET6, ADDR "%en1:1.2.3.4", &addr));         \
+
+TEST_IMPL(ip6_pton) {
+  struct in6_addr addr;
+
+  GOOD_ADDR_LIST(TEST_GOOD)
+  BAD_ADDR_LIST(TEST_BAD)
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+#undef GOOD_ADDR_LIST
+#undef BAD_ADDR_LIST
+
+TEST_IMPL(ip6_sin6_len) {
+  struct sockaddr_in6 s;
+  ASSERT_OK(uv_ip6_addr("::", 0, &s));
+#ifdef SIN6_LEN
+  ASSERT_EQ(s.sin6_len, sizeof(s));
+#endif
+  return 0;
+}