--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-udp-open.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,350 @@
+/* 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>
+#include <string.h>
+
+#ifndef _WIN32
+# include <unistd.h>
+# include <sys/socket.h>
+# include <sys/un.h>
+#endif
+
+static int send_cb_called = 0;
+static int close_cb_called = 0;
+
+static uv_udp_send_t send_req;
+
+
+static void startup(void) {
+#ifdef _WIN32
+    struct WSAData wsa_data;
+    int r = WSAStartup(MAKEWORD(2, 2), &wsa_data);
+    ASSERT_OK(r);
+#endif
+}
+
+
+static uv_os_sock_t create_udp_socket(void) {
+  uv_os_sock_t sock;
+
+  sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+#ifdef _WIN32
+  ASSERT_NE(sock, INVALID_SOCKET);
+#else
+  ASSERT_GE(sock, 0);
+#endif
+
+#ifndef _WIN32
+  {
+    /* Allow reuse of the port. */
+    int yes = 1;
+    int r = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes);
+    ASSERT_OK(r);
+  }
+#endif
+
+  return sock;
+}
+
+
+static void close_socket(uv_os_sock_t sock) {
+  int r;
+#ifdef _WIN32
+  r = closesocket(sock);
+#else
+  r = close(sock);
+#endif
+  ASSERT_OK(r);
+}
+
+
+static void alloc_cb(uv_handle_t* handle,
+                     size_t suggested_size,
+                     uv_buf_t* buf) {
+  static char slab[65536];
+  ASSERT_LE(suggested_size, sizeof(slab));
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+
+static void close_cb(uv_handle_t* handle) {
+  ASSERT_NOT_NULL(handle);
+  close_cb_called++;
+}
+
+
+static void recv_cb(uv_udp_t* handle,
+                       ssize_t nread,
+                       const uv_buf_t* buf,
+                       const struct sockaddr* addr,
+                       unsigned flags) {
+  int r;
+
+  if (nread < 0) {
+    ASSERT(0 && "unexpected error");
+  }
+
+  if (nread == 0) {
+    /* Returning unused buffer. Don't count towards sv_recv_cb_called */
+    ASSERT_NULL(addr);
+    return;
+  }
+
+  ASSERT_OK(flags);
+
+  ASSERT_NOT_NULL(addr);
+  ASSERT_EQ(4, nread);
+  ASSERT_OK(memcmp("PING", buf->base, nread));
+
+  r = uv_udp_recv_stop(handle);
+  ASSERT_OK(r);
+
+  uv_close((uv_handle_t*) handle, close_cb);
+}
+
+
+static void send_cb(uv_udp_send_t* req, int status) {
+  ASSERT_NOT_NULL(req);
+  ASSERT_OK(status);
+
+  send_cb_called++;
+  uv_close((uv_handle_t*)req->handle, close_cb);
+}
+
+
+TEST_IMPL(udp_open) {
+  struct sockaddr_in addr;
+  uv_buf_t buf = uv_buf_init("PING", 4);
+  uv_udp_t client, client2;
+  uv_os_sock_t sock;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  startup();
+  sock = create_udp_socket();
+
+  r = uv_udp_init(uv_default_loop(), &client);
+  ASSERT_OK(r);
+
+  r = uv_udp_open(&client, sock);
+  ASSERT_OK(r);
+
+  r = uv_udp_bind(&client, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  r = uv_udp_recv_start(&client, alloc_cb, recv_cb);
+  ASSERT_OK(r);
+
+  r = uv_udp_send(&send_req,
+                  &client,
+                  &buf,
+                  1,
+                  (const struct sockaddr*) &addr,
+                  send_cb);
+  ASSERT_OK(r);
+
+#ifndef _WIN32
+  {
+    r = uv_udp_init(uv_default_loop(), &client2);
+    ASSERT_OK(r);
+
+    r = uv_udp_open(&client2, sock);
+    ASSERT_EQ(r, UV_EEXIST);
+
+    uv_close((uv_handle_t*) &client2, NULL);
+  }
+#else  /* _WIN32 */
+  (void)client2;
+#endif
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_EQ(1, send_cb_called);
+  ASSERT_EQ(1, close_cb_called);
+
+  ASSERT_OK(client.send_queue_size);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(udp_open_twice) {
+  uv_udp_t client;
+  uv_os_sock_t sock1, sock2;
+  int r;
+
+  startup();
+  sock1 = create_udp_socket();
+  sock2 = create_udp_socket();
+
+  r = uv_udp_init(uv_default_loop(), &client);
+  ASSERT_OK(r);
+
+  r = uv_udp_open(&client, sock1);
+  ASSERT_OK(r);
+
+  r = uv_udp_open(&client, sock2);
+  ASSERT_EQ(r, UV_EBUSY);
+  close_socket(sock2);
+
+  uv_close((uv_handle_t*) &client, NULL);
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+TEST_IMPL(udp_open_bound) {
+  struct sockaddr_in addr;
+  uv_udp_t client;
+  uv_os_sock_t sock;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  startup();
+  sock = create_udp_socket();
+
+  r = bind(sock, (struct sockaddr*) &addr, sizeof(addr));
+  ASSERT_OK(r);
+
+  r = uv_udp_init(uv_default_loop(), &client);
+  ASSERT_OK(r);
+
+  r = uv_udp_open(&client, sock);
+  ASSERT_OK(r);
+
+  r = uv_udp_recv_start(&client, alloc_cb, recv_cb);
+  ASSERT_OK(r);
+
+  uv_close((uv_handle_t*) &client, NULL);
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+TEST_IMPL(udp_open_connect) {
+  struct sockaddr_in addr;
+  uv_buf_t buf = uv_buf_init("PING", 4);
+  uv_udp_t client;
+  uv_udp_t server;
+  uv_os_sock_t sock;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  startup();
+  sock = create_udp_socket();
+
+  r = uv_udp_init(uv_default_loop(), &client);
+  ASSERT_OK(r);
+
+  r = connect(sock, (const struct sockaddr*) &addr, sizeof(addr));
+  ASSERT_OK(r);
+
+  r = uv_udp_open(&client, sock);
+  ASSERT_OK(r);
+
+  r = uv_udp_init(uv_default_loop(), &server);
+  ASSERT_OK(r);
+
+  r = uv_udp_bind(&server, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  r = uv_udp_recv_start(&server, alloc_cb, recv_cb);
+  ASSERT_OK(r);
+
+  r = uv_udp_send(&send_req,
+                  &client,
+                  &buf,
+                  1,
+                  NULL,
+                  send_cb);
+  ASSERT_OK(r);
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT_EQ(1, send_cb_called);
+  ASSERT_EQ(2, close_cb_called);
+
+  ASSERT_OK(client.send_queue_size);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+#ifndef _WIN32
+TEST_IMPL(udp_send_unix) {
+  /* Test that "uv_udp_send()" supports sending over
+     a "sockaddr_un" address. */
+  struct sockaddr_un addr;
+  uv_udp_t handle;
+  uv_udp_send_t req;
+  uv_loop_t* loop;
+  uv_buf_t buf = uv_buf_init("PING", 4);
+  int fd;
+  int r;
+
+  loop = uv_default_loop();
+
+  memset(&addr, 0, sizeof addr);
+  addr.sun_family = AF_UNIX;
+  ASSERT_LT(strlen(TEST_PIPENAME), sizeof(addr.sun_path));
+  memcpy(addr.sun_path, TEST_PIPENAME, strlen(TEST_PIPENAME));
+
+  fd = socket(AF_UNIX, SOCK_STREAM, 0);
+  ASSERT_GE(fd, 0);
+
+  unlink(TEST_PIPENAME);
+  ASSERT_OK(bind(fd, (const struct sockaddr*)&addr, sizeof addr));
+  ASSERT_OK(listen(fd, 1));
+
+  r = uv_udp_init(loop, &handle);
+  ASSERT_OK(r);
+  r = uv_udp_open(&handle, fd);
+  ASSERT_OK(r);
+  uv_run(loop, UV_RUN_DEFAULT);
+
+  r = uv_udp_send(&req,
+                  &handle,
+                  &buf,
+                  1,
+                  (const struct sockaddr*) &addr,
+                  NULL);
+  ASSERT_OK(r);
+
+  uv_close((uv_handle_t*)&handle, NULL);
+  uv_run(loop, UV_RUN_DEFAULT);
+  close(fd);
+  unlink(TEST_PIPENAME);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+#endif