--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/echo-server.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,431 @@
+/* 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>
+
+typedef struct {
+  uv_write_t req;
+  uv_buf_t buf;
+} write_req_t;
+
+static uv_loop_t* loop;
+
+static int server_closed;
+static stream_type serverType;
+static uv_tcp_t tcpServer;
+static uv_udp_t udpServer;
+static uv_pipe_t pipeServer;
+static uv_handle_t* server;
+static uv_udp_send_t* send_freelist;
+
+static void after_write(uv_write_t* req, int status);
+static void after_read(uv_stream_t*, ssize_t nread, const uv_buf_t* buf);
+static void on_close(uv_handle_t* peer);
+static void on_server_close(uv_handle_t* handle);
+static void on_connection(uv_stream_t*, int status);
+
+
+static void after_write(uv_write_t* req, int status) {
+  write_req_t* wr;
+
+  /* Free the read/write buffer and the request */
+  wr = (write_req_t*) req;
+  free(wr->buf.base);
+  free(wr);
+
+  if (status == 0)
+    return;
+
+  fprintf(stderr,
+          "uv_write error: %s - %s\n",
+          uv_err_name(status),
+          uv_strerror(status));
+}
+
+
+static void after_shutdown(uv_shutdown_t* req, int status) {
+  ASSERT_OK(status);
+  uv_close((uv_handle_t*) req->handle, on_close);
+  free(req);
+}
+
+
+static void on_shutdown(uv_shutdown_t* req, int status) {
+  ASSERT_OK(status);
+  free(req);
+}
+
+
+static void after_read(uv_stream_t* handle,
+                       ssize_t nread,
+                       const uv_buf_t* buf) {
+  int i;
+  write_req_t *wr;
+  uv_shutdown_t* sreq;
+  int shutdown = 0;
+
+  if (nread < 0) {
+    /* Error or EOF */
+    ASSERT_EQ(nread, UV_EOF);
+
+    free(buf->base);
+    sreq = malloc(sizeof* sreq);
+    if (uv_is_writable(handle)) {
+      ASSERT_OK(uv_shutdown(sreq, handle, after_shutdown));
+    }
+    return;
+  }
+
+  if (nread == 0) {
+    /* Everything OK, but nothing read. */
+    free(buf->base);
+    return;
+  }
+
+  /*
+   * Scan for the letter Q which signals that we should quit the server.
+   * If we get QS it means close the stream.
+   * If we get QSS it means shutdown the stream.
+   * If we get QSH it means disable linger before close the socket.
+   */
+  for (i = 0; i < nread; i++) {
+    if (buf->base[i] == 'Q') {
+      if (i + 1 < nread && buf->base[i + 1] == 'S') {
+        int reset = 0;
+        if (i + 2 < nread && buf->base[i + 2] == 'S')
+          shutdown = 1;
+        if (i + 2 < nread && buf->base[i + 2] == 'H')
+          reset = 1;
+        if (reset && handle->type == UV_TCP)
+          ASSERT_OK(uv_tcp_close_reset((uv_tcp_t*) handle, on_close));
+        else if (shutdown)
+          break;
+        else
+          uv_close((uv_handle_t*) handle, on_close);
+        free(buf->base);
+        return;
+      } else if (!server_closed) {
+        uv_close(server, on_server_close);
+        server_closed = 1;
+      }
+    }
+  }
+
+  wr = (write_req_t*) malloc(sizeof *wr);
+  ASSERT_NOT_NULL(wr);
+  wr->buf = uv_buf_init(buf->base, nread);
+
+  if (uv_write(&wr->req, handle, &wr->buf, 1, after_write)) {
+    FATAL("uv_write failed");
+  }
+
+  if (shutdown)
+    ASSERT_OK(uv_shutdown(malloc(sizeof* sreq), handle, on_shutdown));
+}
+
+
+static void on_close(uv_handle_t* peer) {
+  free(peer);
+}
+
+
+static void echo_alloc(uv_handle_t* handle,
+                       size_t suggested_size,
+                       uv_buf_t* buf) {
+  buf->base = malloc(suggested_size);
+  buf->len = suggested_size;
+}
+
+static void slab_alloc(uv_handle_t* handle,
+                       size_t suggested_size,
+                       uv_buf_t* buf) {
+  /* up to 16 datagrams at once */
+  static char slab[16 * 64 * 1024];
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+static void on_connection(uv_stream_t* server, int status) {
+  uv_stream_t* stream;
+  int r;
+
+  if (status != 0) {
+    fprintf(stderr, "Connect error %s\n", uv_err_name(status));
+  }
+  ASSERT_OK(status);
+
+  switch (serverType) {
+  case TCP:
+    stream = malloc(sizeof(uv_tcp_t));
+    ASSERT_NOT_NULL(stream);
+    r = uv_tcp_init(loop, (uv_tcp_t*)stream);
+    ASSERT_OK(r);
+    break;
+
+  case PIPE:
+    stream = malloc(sizeof(uv_pipe_t));
+    ASSERT_NOT_NULL(stream);
+    r = uv_pipe_init(loop, (uv_pipe_t*)stream, 0);
+    ASSERT_OK(r);
+    break;
+
+  default:
+    ASSERT(0 && "Bad serverType");
+    abort();
+  }
+
+  /* associate server with stream */
+  stream->data = server;
+
+  r = uv_accept(server, stream);
+  ASSERT_OK(r);
+
+  r = uv_read_start(stream, echo_alloc, after_read);
+  ASSERT_OK(r);
+}
+
+
+static void on_server_close(uv_handle_t* handle) {
+  ASSERT_PTR_EQ(handle, server);
+}
+
+static uv_udp_send_t* send_alloc(void) {
+  uv_udp_send_t* req = send_freelist;
+  if (req != NULL)
+    send_freelist = req->data;
+  else
+    req = malloc(sizeof(*req));
+  return req;
+}
+
+static void on_send(uv_udp_send_t* req, int status) {
+  ASSERT_NOT_NULL(req);
+  ASSERT_OK(status);
+  req->data = send_freelist;
+  send_freelist = req;
+}
+
+static void on_recv(uv_udp_t* handle,
+                    ssize_t nread,
+                    const uv_buf_t* rcvbuf,
+                    const struct sockaddr* addr,
+                    unsigned flags) {
+  uv_buf_t sndbuf;
+  uv_udp_send_t* req;
+
+  if (nread == 0) {
+    /* Everything OK, but nothing read. */
+    return;
+  }
+
+  ASSERT_GT(nread, 0);
+  ASSERT_EQ(addr->sa_family, AF_INET);
+
+  req = send_alloc();
+  ASSERT_NOT_NULL(req);
+  sndbuf = uv_buf_init(rcvbuf->base, nread);
+  ASSERT_LE(0, uv_udp_send(req, handle, &sndbuf, 1, addr, on_send));
+}
+
+static int tcp4_echo_start(int port) {
+  struct sockaddr_in addr;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", port, &addr));
+
+  server = (uv_handle_t*)&tcpServer;
+  serverType = TCP;
+
+  r = uv_tcp_init(loop, &tcpServer);
+  if (r) {
+    /* TODO: Error codes */
+    fprintf(stderr, "Socket creation error\n");
+    return 1;
+  }
+
+  r = uv_tcp_bind(&tcpServer, (const struct sockaddr*) &addr, 0);
+  if (r) {
+    /* TODO: Error codes */
+    fprintf(stderr, "Bind error\n");
+    return 1;
+  }
+
+  r = uv_listen((uv_stream_t*)&tcpServer, SOMAXCONN, on_connection);
+  if (r) {
+    /* TODO: Error codes */
+    fprintf(stderr, "Listen error %s\n", uv_err_name(r));
+    return 1;
+  }
+
+  return 0;
+}
+
+
+static int tcp6_echo_start(int port) {
+  struct sockaddr_in6 addr6;
+  int r;
+
+  ASSERT_OK(uv_ip6_addr("::1", port, &addr6));
+
+  server = (uv_handle_t*)&tcpServer;
+  serverType = TCP;
+
+  r = uv_tcp_init(loop, &tcpServer);
+  if (r) {
+    /* TODO: Error codes */
+    fprintf(stderr, "Socket creation error\n");
+    return 1;
+  }
+
+  /* IPv6 is optional as not all platforms support it */
+  r = uv_tcp_bind(&tcpServer, (const struct sockaddr*) &addr6, 0);
+  if (r) {
+    /* show message but return OK */
+    fprintf(stderr, "IPv6 not supported\n");
+    return 0;
+  }
+
+  r = uv_listen((uv_stream_t*)&tcpServer, SOMAXCONN, on_connection);
+  if (r) {
+    /* TODO: Error codes */
+    fprintf(stderr, "Listen error\n");
+    return 1;
+  }
+
+  return 0;
+}
+
+
+static int udp4_echo_start(int port) {
+  struct sockaddr_in addr;
+  int r;
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", port, &addr));
+  server = (uv_handle_t*)&udpServer;
+  serverType = UDP;
+
+  r = uv_udp_init(loop, &udpServer);
+  if (r) {
+    fprintf(stderr, "uv_udp_init: %s\n", uv_strerror(r));
+    return 1;
+  }
+
+  r = uv_udp_bind(&udpServer, (const struct sockaddr*) &addr, 0);
+  if (r) {
+    fprintf(stderr, "uv_udp_bind: %s\n", uv_strerror(r));
+    return 1;
+  }
+
+  r = uv_udp_recv_start(&udpServer, slab_alloc, on_recv);
+  if (r) {
+    fprintf(stderr, "uv_udp_recv_start: %s\n", uv_strerror(r));
+    return 1;
+  }
+
+  return 0;
+}
+
+
+static int pipe_echo_start(char* pipeName) {
+  int r;
+
+#ifndef _WIN32
+  {
+    uv_fs_t req;
+    uv_fs_unlink(NULL, &req, pipeName, NULL);
+    uv_fs_req_cleanup(&req);
+  }
+#endif
+
+  server = (uv_handle_t*)&pipeServer;
+  serverType = PIPE;
+
+  r = uv_pipe_init(loop, &pipeServer, 0);
+  if (r) {
+    fprintf(stderr, "uv_pipe_init: %s\n", uv_strerror(r));
+    return 1;
+  }
+
+  r = uv_pipe_bind(&pipeServer, pipeName);
+  if (r) {
+    fprintf(stderr, "uv_pipe_bind: %s\n", uv_strerror(r));
+    return 1;
+  }
+
+  r = uv_listen((uv_stream_t*)&pipeServer, SOMAXCONN, on_connection);
+  if (r) {
+    fprintf(stderr, "uv_pipe_listen: %s\n", uv_strerror(r));
+    return 1;
+  }
+
+  return 0;
+}
+
+
+HELPER_IMPL(tcp4_echo_server) {
+  loop = uv_default_loop();
+
+  if (tcp4_echo_start(TEST_PORT))
+    return 1;
+
+  notify_parent_process();
+  uv_run(loop, UV_RUN_DEFAULT);
+  return 0;
+}
+
+
+HELPER_IMPL(tcp6_echo_server) {
+  loop = uv_default_loop();
+
+  if (tcp6_echo_start(TEST_PORT))
+    return 1;
+
+  notify_parent_process();
+  uv_run(loop, UV_RUN_DEFAULT);
+  return 0;
+}
+
+
+HELPER_IMPL(pipe_echo_server) {
+  loop = uv_default_loop();
+
+  if (pipe_echo_start(TEST_PIPENAME))
+    return 1;
+
+  notify_parent_process();
+  uv_run(loop, UV_RUN_DEFAULT);
+  return 0;
+}
+
+
+HELPER_IMPL(udp4_echo_server) {
+  loop = uv_default_loop();
+
+  if (udp4_echo_start(TEST_PORT))
+    return 1;
+
+  notify_parent_process();
+  uv_run(loop, UV_RUN_DEFAULT);
+  return 0;
+}