--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-ipc.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,857 @@
+/* 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>
+
+static uv_pipe_t channel;
+static uv_tcp_t tcp_server;
+static uv_tcp_t tcp_server2;
+static uv_tcp_t tcp_connection;
+
+static int exit_cb_called;
+static int read_cb_called;
+static int tcp_write_cb_called;
+static int tcp_read_cb_called;
+static int on_pipe_read_called;
+static int local_conn_accepted;
+static int remote_conn_accepted;
+static int tcp_server_listening;
+static uv_write_t write_req;
+static uv_write_t write_req2;
+static uv_write_t conn_notify_req;
+static int close_cb_called;
+static int connection_accepted;
+static int tcp_conn_read_cb_called;
+static int tcp_conn_write_cb_called;
+static int send_zero_write;
+
+typedef struct {
+  uv_connect_t conn_req;
+  uv_write_t tcp_write_req;
+  uv_tcp_t conn;
+} tcp_conn;
+
+#define CONN_COUNT 100
+#define BACKLOG 128
+
+
+static void close_server_conn_cb(uv_handle_t* handle) {
+  free(handle);
+}
+
+
+static void on_connection(uv_stream_t* server, int status) {
+  uv_tcp_t* conn;
+  int r;
+
+  if (!local_conn_accepted) {
+    /* Accept the connection and close it.  Also and close the server. */
+    ASSERT_OK(status);
+    ASSERT_PTR_EQ(&tcp_server, server);
+
+    conn = malloc(sizeof(*conn));
+    ASSERT_NOT_NULL(conn);
+    r = uv_tcp_init(server->loop, conn);
+    ASSERT_OK(r);
+
+    r = uv_accept(server, (uv_stream_t*)conn);
+    ASSERT_OK(r);
+
+    uv_close((uv_handle_t*)conn, close_server_conn_cb);
+    uv_close((uv_handle_t*)server, NULL);
+    local_conn_accepted = 1;
+  }
+}
+
+
+static void exit_cb(uv_process_t* process,
+                    int64_t exit_status,
+                    int term_signal) {
+  printf("exit_cb\n");
+  exit_cb_called++;
+  ASSERT_OK(exit_status);
+  ASSERT_OK(term_signal);
+  uv_close((uv_handle_t*)process, NULL);
+}
+
+
+static void on_alloc(uv_handle_t* handle,
+                     size_t suggested_size,
+                     uv_buf_t* buf) {
+  buf->base = malloc(suggested_size);
+  buf->len = suggested_size;
+}
+
+
+static void close_client_conn_cb(uv_handle_t* handle) {
+  tcp_conn* p = (tcp_conn*)handle->data;
+  free(p);
+}
+
+
+static void connect_cb(uv_connect_t* req, int status) {
+  uv_close((uv_handle_t*)req->handle, close_client_conn_cb);
+}
+
+
+static void make_many_connections(void) {
+  tcp_conn* conn;
+  struct sockaddr_in addr;
+  int r, i;
+
+  for (i = 0; i < CONN_COUNT; i++) {
+    conn = malloc(sizeof(*conn));
+    ASSERT_NOT_NULL(conn);
+
+    r = uv_tcp_init(uv_default_loop(), &conn->conn);
+    ASSERT_OK(r);
+    ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+    r = uv_tcp_connect(&conn->conn_req,
+                       (uv_tcp_t*) &conn->conn,
+                       (const struct sockaddr*) &addr,
+                       connect_cb);
+    ASSERT_OK(r);
+
+    conn->conn.data = conn;
+  }
+}
+
+
+static void on_read(uv_stream_t* handle,
+                    ssize_t nread,
+                    const uv_buf_t* buf) {
+  int r;
+  uv_pipe_t* pipe;
+  uv_handle_type pending;
+  uv_buf_t outbuf;
+
+  pipe = (uv_pipe_t*) handle;
+
+  if (nread == 0) {
+    /* Everything OK, but nothing read. */
+    free(buf->base);
+    return;
+  }
+
+  if (nread < 0) {
+    if (nread == UV_EOF) {
+      free(buf->base);
+      return;
+    }
+
+    printf("error recving on channel: %s\n", uv_strerror(nread));
+    abort();
+  }
+
+  fprintf(stderr, "got %d bytes\n", (int)nread);
+
+  pending = uv_pipe_pending_type(pipe);
+  if (!tcp_server_listening) {
+    ASSERT_EQ(1, uv_pipe_pending_count(pipe));
+    ASSERT_GT(nread, 0);
+    ASSERT_NOT_NULL(buf->base);
+    ASSERT_NE(pending, UV_UNKNOWN_HANDLE);
+    read_cb_called++;
+
+    /* Accept the pending TCP server, and start listening on it. */
+    ASSERT_EQ(pending, UV_TCP);
+    r = uv_tcp_init(uv_default_loop(), &tcp_server);
+    ASSERT_OK(r);
+
+    r = uv_accept((uv_stream_t*)pipe, (uv_stream_t*)&tcp_server);
+    ASSERT_OK(r);
+
+    r = uv_listen((uv_stream_t*)&tcp_server, BACKLOG, on_connection);
+    ASSERT_OK(r);
+
+    tcp_server_listening = 1;
+
+    /* Make sure that the expected data is correctly multiplexed. */
+    ASSERT_MEM_EQ("hello\n", buf->base, nread);
+
+    outbuf = uv_buf_init("foobar\n", 7);
+    r = uv_write(&write_req, (uv_stream_t*)pipe, &outbuf, 1, NULL);
+    ASSERT_OK(r);
+
+    /* Create a bunch of connections to get both servers to accept. */
+    make_many_connections();
+  } else if (memcmp("accepted_connection\n", buf->base, nread) == 0) {
+    /* Remote server has accepted a connection.  Close the channel. */
+    ASSERT_OK(uv_pipe_pending_count(pipe));
+    ASSERT_EQ(pending, UV_UNKNOWN_HANDLE);
+    remote_conn_accepted = 1;
+    uv_close((uv_handle_t*)&channel, NULL);
+  }
+
+  free(buf->base);
+}
+
+#ifdef _WIN32
+static void on_read_listen_after_bound_twice(uv_stream_t* handle,
+                                             ssize_t nread,
+                                             const uv_buf_t* buf) {
+  int r;
+  uv_pipe_t* pipe;
+  uv_handle_type pending;
+
+  pipe = (uv_pipe_t*) handle;
+
+  if (nread == 0) {
+    /* Everything OK, but nothing read. */
+    free(buf->base);
+    return;
+  }
+
+  if (nread < 0) {
+    if (nread == UV_EOF) {
+      free(buf->base);
+      return;
+    }
+
+    printf("error recving on channel: %s\n", uv_strerror(nread));
+    abort();
+  }
+
+  fprintf(stderr, "got %d bytes\n", (int)nread);
+
+  ASSERT_GT(uv_pipe_pending_count(pipe), 0);
+  pending = uv_pipe_pending_type(pipe);
+  ASSERT_GT(nread, 0);
+  ASSERT_NOT_NULL(buf->base);
+  ASSERT_NE(pending, UV_UNKNOWN_HANDLE);
+  read_cb_called++;
+
+  if (read_cb_called == 1) {
+    /* Accept the first TCP server, and start listening on it. */
+    ASSERT_EQ(pending, UV_TCP);
+    r = uv_tcp_init(uv_default_loop(), &tcp_server);
+    ASSERT_OK(r);
+
+    r = uv_accept((uv_stream_t*)pipe, (uv_stream_t*)&tcp_server);
+    ASSERT_OK(r);
+
+    r = uv_listen((uv_stream_t*)&tcp_server, BACKLOG, on_connection);
+    ASSERT_OK(r);
+  } else if (read_cb_called == 2) {
+    /* Accept the second TCP server, and start listening on it. */
+    ASSERT_EQ(pending, UV_TCP);
+    r = uv_tcp_init(uv_default_loop(), &tcp_server2);
+    ASSERT_OK(r);
+
+    r = uv_accept((uv_stream_t*)pipe, (uv_stream_t*)&tcp_server2);
+    ASSERT_OK(r);
+
+    r = uv_listen((uv_stream_t*)&tcp_server2, BACKLOG, on_connection);
+    ASSERT_EQ(r, UV_EADDRINUSE);
+
+    uv_close((uv_handle_t*)&tcp_server, NULL);
+    uv_close((uv_handle_t*)&tcp_server2, NULL);
+    ASSERT_OK(uv_pipe_pending_count(pipe));
+    uv_close((uv_handle_t*)&channel, NULL);
+  }
+
+  free(buf->base);
+}
+#endif
+
+void spawn_helper(uv_pipe_t* channel,
+                  uv_process_t* process,
+                  const char* helper) {
+  uv_process_options_t options;
+  size_t exepath_size;
+  char exepath[1024];
+  char* args[3];
+  int r;
+  uv_stdio_container_t stdio[3];
+
+  r = uv_pipe_init(uv_default_loop(), channel, 1);
+  ASSERT_OK(r);
+  ASSERT_NE(0, channel->ipc);
+
+  exepath_size = sizeof(exepath);
+  r = uv_exepath(exepath, &exepath_size);
+  ASSERT_OK(r);
+
+  exepath[exepath_size] = '\0';
+  args[0] = exepath;
+  args[1] = (char*)helper;
+  args[2] = NULL;
+
+  memset(&options, 0, sizeof(options));
+  options.file = exepath;
+  options.args = args;
+  options.exit_cb = exit_cb;
+  options.stdio = stdio;
+  options.stdio_count = ARRAY_SIZE(stdio);
+
+  stdio[0].flags = UV_CREATE_PIPE | UV_READABLE_PIPE | UV_WRITABLE_PIPE;
+  stdio[0].data.stream = (uv_stream_t*) channel;
+  stdio[1].flags = UV_INHERIT_FD;
+  stdio[1].data.fd = 1;
+  stdio[2].flags = UV_INHERIT_FD;
+  stdio[2].data.fd = 2;
+
+  r = uv_spawn(uv_default_loop(), process, &options);
+  ASSERT_OK(r);
+}
+
+
+static void on_tcp_write(uv_write_t* req, int status) {
+  ASSERT_OK(status);
+  ASSERT_PTR_EQ(req->handle, &tcp_connection);
+  tcp_write_cb_called++;
+}
+
+
+static void on_read_alloc(uv_handle_t* handle,
+                          size_t suggested_size,
+                          uv_buf_t* buf) {
+  buf->base = malloc(suggested_size);
+  buf->len = suggested_size;
+}
+
+
+static void on_tcp_read(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* buf) {
+  ASSERT_GT(nread, 0);
+  ASSERT_MEM_EQ("hello again\n", buf->base, nread);
+  ASSERT_PTR_EQ(tcp, &tcp_connection);
+  free(buf->base);
+
+  tcp_read_cb_called++;
+
+  uv_close((uv_handle_t*)tcp, NULL);
+  uv_close((uv_handle_t*)&channel, NULL);
+}
+
+
+static void on_read_connection(uv_stream_t* handle,
+                               ssize_t nread,
+                               const uv_buf_t* buf) {
+  int r;
+  uv_buf_t outbuf;
+  uv_pipe_t* pipe;
+  uv_handle_type pending;
+
+  pipe = (uv_pipe_t*) handle;
+  if (nread == 0) {
+    /* Everything OK, but nothing read. */
+    free(buf->base);
+    return;
+  }
+
+  if (nread < 0) {
+    if (nread == UV_EOF) {
+      free(buf->base);
+      return;
+    }
+
+    printf("error recving on channel: %s\n", uv_strerror(nread));
+    abort();
+  }
+
+  fprintf(stderr, "got %d bytes\n", (int)nread);
+
+  ASSERT_EQ(1, uv_pipe_pending_count(pipe));
+  pending = uv_pipe_pending_type(pipe);
+
+  ASSERT_GT(nread, 0);
+  ASSERT_NOT_NULL(buf->base);
+  ASSERT_NE(pending, UV_UNKNOWN_HANDLE);
+  read_cb_called++;
+
+  /* Accept the pending TCP connection */
+  ASSERT_EQ(pending, UV_TCP);
+  r = uv_tcp_init(uv_default_loop(), &tcp_connection);
+  ASSERT_OK(r);
+
+  r = uv_accept(handle, (uv_stream_t*)&tcp_connection);
+  ASSERT_OK(r);
+
+  /* Make sure that the expected data is correctly multiplexed. */
+  ASSERT_MEM_EQ("hello\n", buf->base, nread);
+
+  /* Write/read to/from the connection */
+  outbuf = uv_buf_init("world\n", 6);
+  r = uv_write(&write_req, (uv_stream_t*)&tcp_connection, &outbuf, 1,
+    on_tcp_write);
+  ASSERT_OK(r);
+
+  r = uv_read_start((uv_stream_t*)&tcp_connection, on_read_alloc, on_tcp_read);
+  ASSERT_OK(r);
+
+  free(buf->base);
+}
+
+
+static void on_read_send_zero(uv_stream_t* handle,
+                              ssize_t nread,
+                              const uv_buf_t* buf) {
+  ASSERT(nread == 0 || nread == UV_EOF);
+  free(buf->base);
+}
+
+
+static int run_ipc_test(const char* helper, uv_read_cb read_cb) {
+  uv_process_t process;
+  int r;
+
+  spawn_helper(&channel, &process, helper);
+  uv_read_start((uv_stream_t*)&channel, on_alloc, read_cb);
+
+  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(ipc_listen_before_write) {
+#if defined(NO_SEND_HANDLE_ON_PIPE)
+  RETURN_SKIP(NO_SEND_HANDLE_ON_PIPE);
+#endif
+  int r = run_ipc_test("ipc_helper_listen_before_write", on_read);
+  ASSERT_EQ(1, local_conn_accepted);
+  ASSERT_EQ(1, remote_conn_accepted);
+  ASSERT_EQ(1, read_cb_called);
+  ASSERT_EQ(1, exit_cb_called);
+  return r;
+}
+
+
+TEST_IMPL(ipc_listen_after_write) {
+#if defined(NO_SEND_HANDLE_ON_PIPE)
+  RETURN_SKIP(NO_SEND_HANDLE_ON_PIPE);
+#endif
+  int r = run_ipc_test("ipc_helper_listen_after_write", on_read);
+  ASSERT_EQ(1, local_conn_accepted);
+  ASSERT_EQ(1, remote_conn_accepted);
+  ASSERT_EQ(1, read_cb_called);
+  ASSERT_EQ(1, exit_cb_called);
+  return r;
+}
+
+
+TEST_IMPL(ipc_tcp_connection) {
+#if defined(NO_SEND_HANDLE_ON_PIPE)
+  RETURN_SKIP(NO_SEND_HANDLE_ON_PIPE);
+#endif
+  int r = run_ipc_test("ipc_helper_tcp_connection", on_read_connection);
+  ASSERT_EQ(1, read_cb_called);
+  ASSERT_EQ(1, tcp_write_cb_called);
+  ASSERT_EQ(1, tcp_read_cb_called);
+  ASSERT_EQ(1, exit_cb_called);
+  return r;
+}
+
+
+#ifdef _WIN32
+TEST_IMPL(listen_with_simultaneous_accepts) {
+  uv_tcp_t server;
+  int r;
+  struct sockaddr_in addr;
+
+  ASSERT_OK(uv_ip4_addr("0.0.0.0", TEST_PORT, &addr));
+
+  r = uv_tcp_init(uv_default_loop(), &server);
+  ASSERT_OK(r);
+
+  r = uv_tcp_bind(&server, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  r = uv_tcp_simultaneous_accepts(&server, 1);
+  ASSERT_OK(r);
+
+  r = uv_listen((uv_stream_t*)&server, SOMAXCONN, NULL);
+  ASSERT_OK(r);
+  ASSERT_EQ(32, server.reqs_pending);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+TEST_IMPL(listen_no_simultaneous_accepts) {
+  uv_tcp_t server;
+  int r;
+  struct sockaddr_in addr;
+
+  ASSERT_OK(uv_ip4_addr("0.0.0.0", TEST_PORT, &addr));
+
+  r = uv_tcp_init(uv_default_loop(), &server);
+  ASSERT_OK(r);
+
+  r = uv_tcp_bind(&server, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  r = uv_tcp_simultaneous_accepts(&server, 0);
+  ASSERT_OK(r);
+
+  r = uv_listen((uv_stream_t*)&server, SOMAXCONN, NULL);
+  ASSERT_OK(r);
+  ASSERT_EQ(1, server.reqs_pending);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+TEST_IMPL(ipc_listen_after_bind_twice) {
+#if defined(NO_SEND_HANDLE_ON_PIPE)
+  RETURN_SKIP(NO_SEND_HANDLE_ON_PIPE);
+#endif
+  int r = run_ipc_test("ipc_helper_bind_twice", on_read_listen_after_bound_twice);
+  ASSERT_EQ(2, read_cb_called);
+  ASSERT_EQ(1, exit_cb_called);
+  return r;
+}
+#endif
+
+TEST_IMPL(ipc_send_zero) {
+  int r;
+  r = run_ipc_test("ipc_helper_send_zero", on_read_send_zero);
+  ASSERT_OK(r);
+  return 0;
+}
+
+
+/* Everything here runs in a child process. */
+
+static tcp_conn conn;
+
+
+static void close_cb(uv_handle_t* handle) {
+  close_cb_called++;
+}
+
+
+static void conn_notify_write_cb(uv_write_t* req, int status) {
+  uv_close((uv_handle_t*)&tcp_server, close_cb);
+  uv_close((uv_handle_t*)&channel, close_cb);
+}
+
+
+static void tcp_connection_write_cb(uv_write_t* req, int status) {
+  ASSERT_PTR_EQ(&conn.conn, req->handle);
+  uv_close((uv_handle_t*)req->handle, close_cb);
+  uv_close((uv_handle_t*)&channel, close_cb);
+  uv_close((uv_handle_t*)&tcp_server, close_cb);
+  tcp_conn_write_cb_called++;
+}
+
+
+static void send_zero_write_cb(uv_write_t* req, int status) {
+  ASSERT_OK(status);
+  send_zero_write++;
+}
+
+static void on_tcp_child_process_read(uv_stream_t* tcp,
+                                      ssize_t nread,
+                                      const uv_buf_t* buf) {
+  uv_buf_t outbuf;
+  int r;
+
+  if (nread < 0) {
+    if (nread == UV_EOF) {
+      free(buf->base);
+      return;
+    }
+
+    printf("error recving on tcp connection: %s\n", uv_strerror(nread));
+    abort();
+  }
+
+  ASSERT_GT(nread, 0);
+  ASSERT_MEM_EQ("world\n", buf->base, nread);
+  on_pipe_read_called++;
+  free(buf->base);
+
+  /* Write to the socket */
+  outbuf = uv_buf_init("hello again\n", 12);
+  r = uv_write(&conn.tcp_write_req, tcp, &outbuf, 1, tcp_connection_write_cb);
+  ASSERT_OK(r);
+
+  tcp_conn_read_cb_called++;
+}
+
+
+static void connect_child_process_cb(uv_connect_t* req, int status) {
+  int r;
+
+  ASSERT_OK(status);
+  r = uv_read_start(req->handle, on_read_alloc, on_tcp_child_process_read);
+  ASSERT_OK(r);
+}
+
+
+static void ipc_on_connection(uv_stream_t* server, int status) {
+  int r;
+  uv_buf_t buf;
+
+  if (!connection_accepted) {
+    /*
+     * Accept the connection and close it.  Also let the other
+     * side know.
+     */
+    ASSERT_OK(status);
+    ASSERT_PTR_EQ(&tcp_server, server);
+
+    r = uv_tcp_init(server->loop, &conn.conn);
+    ASSERT_OK(r);
+
+    r = uv_accept(server, (uv_stream_t*)&conn.conn);
+    ASSERT_OK(r);
+
+    uv_close((uv_handle_t*)&conn.conn, close_cb);
+
+    buf = uv_buf_init("accepted_connection\n", 20);
+    r = uv_write2(&conn_notify_req, (uv_stream_t*)&channel, &buf, 1,
+      NULL, conn_notify_write_cb);
+    ASSERT_OK(r);
+
+    connection_accepted = 1;
+  }
+}
+
+
+static void close_and_free_cb(uv_handle_t* handle) {
+  close_cb_called++;
+  free(handle);
+}
+
+static void ipc_on_connection_tcp_conn(uv_stream_t* server, int status) {
+  int r;
+  uv_buf_t buf;
+  uv_tcp_t* conn;
+
+  ASSERT_OK(status);
+  ASSERT_PTR_EQ(&tcp_server, server);
+
+  conn = malloc(sizeof(*conn));
+  ASSERT_NOT_NULL(conn);
+
+  r = uv_tcp_init(server->loop, conn);
+  ASSERT_OK(r);
+
+  r = uv_accept(server, (uv_stream_t*)conn);
+  ASSERT_OK(r);
+
+  /* Send the accepted connection to the other process */
+  buf = uv_buf_init("hello\n", 6);
+  r = uv_write2(&conn_notify_req, (uv_stream_t*)&channel, &buf, 1,
+    (uv_stream_t*)conn, NULL);
+  ASSERT_OK(r);
+
+  r = uv_read_start((uv_stream_t*) conn,
+                    on_read_alloc,
+                    on_tcp_child_process_read);
+  ASSERT_OK(r);
+
+  uv_close((uv_handle_t*)conn, close_and_free_cb);
+}
+
+
+int ipc_helper(int listen_after_write) {
+  /*
+   * This is launched from test-ipc.c. stdin is a duplex channel that we
+   * over which a handle will be transmitted.
+   */
+  struct sockaddr_in addr;
+  int r;
+  uv_buf_t buf;
+
+  ASSERT_OK(uv_ip4_addr("0.0.0.0", TEST_PORT, &addr));
+
+  r = uv_pipe_init(uv_default_loop(), &channel, 1);
+  ASSERT_OK(r);
+
+  uv_pipe_open(&channel, 0);
+
+  ASSERT_EQ(1, uv_is_readable((uv_stream_t*) &channel));
+  ASSERT_EQ(1, uv_is_writable((uv_stream_t*) &channel));
+  ASSERT_OK(uv_is_closing((uv_handle_t*) &channel));
+
+  r = uv_tcp_init(uv_default_loop(), &tcp_server);
+  ASSERT_OK(r);
+
+  r = uv_tcp_bind(&tcp_server, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  if (!listen_after_write) {
+    r = uv_listen((uv_stream_t*)&tcp_server, BACKLOG, ipc_on_connection);
+    ASSERT_OK(r);
+  }
+
+  buf = uv_buf_init("hello\n", 6);
+  r = uv_write2(&write_req, (uv_stream_t*)&channel, &buf, 1,
+      (uv_stream_t*)&tcp_server, NULL);
+  ASSERT_OK(r);
+
+  if (listen_after_write) {
+    r = uv_listen((uv_stream_t*)&tcp_server, BACKLOG, ipc_on_connection);
+    ASSERT_OK(r);
+  }
+
+  notify_parent_process();
+  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  ASSERT_EQ(1, connection_accepted);
+  ASSERT_EQ(3, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+
+int ipc_helper_tcp_connection(void) {
+  /*
+   * This is launched from test-ipc.c. stdin is a duplex channel
+   * over which a handle will be transmitted.
+   */
+
+  int r;
+  struct sockaddr_in addr;
+
+  r = uv_pipe_init(uv_default_loop(), &channel, 1);
+  ASSERT_OK(r);
+
+  uv_pipe_open(&channel, 0);
+
+  ASSERT_EQ(1, uv_is_readable((uv_stream_t*) &channel));
+  ASSERT_EQ(1, uv_is_writable((uv_stream_t*) &channel));
+  ASSERT_OK(uv_is_closing((uv_handle_t*) &channel));
+
+  r = uv_tcp_init(uv_default_loop(), &tcp_server);
+  ASSERT_OK(r);
+
+  ASSERT_OK(uv_ip4_addr("0.0.0.0", TEST_PORT, &addr));
+
+  r = uv_tcp_bind(&tcp_server, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  r = uv_listen((uv_stream_t*)&tcp_server, BACKLOG, ipc_on_connection_tcp_conn);
+  ASSERT_OK(r);
+
+  /* Make a connection to the server */
+  r = uv_tcp_init(uv_default_loop(), &conn.conn);
+  ASSERT_OK(r);
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+
+  r = uv_tcp_connect(&conn.conn_req,
+                     (uv_tcp_t*) &conn.conn,
+                     (const struct sockaddr*) &addr,
+                     connect_child_process_cb);
+  ASSERT_OK(r);
+
+  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  ASSERT_EQ(1, tcp_conn_read_cb_called);
+  ASSERT_EQ(1, tcp_conn_write_cb_called);
+  ASSERT_EQ(4, close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+int ipc_helper_bind_twice(void) {
+  /*
+   * This is launched from test-ipc.c. stdin is a duplex channel
+   * over which two handles will be transmitted.
+   */
+  struct sockaddr_in addr;
+  int r;
+  uv_buf_t buf;
+
+  ASSERT_OK(uv_ip4_addr("0.0.0.0", TEST_PORT, &addr));
+
+  r = uv_pipe_init(uv_default_loop(), &channel, 1);
+  ASSERT_OK(r);
+
+  uv_pipe_open(&channel, 0);
+
+  ASSERT_EQ(1, uv_is_readable((uv_stream_t*) &channel));
+  ASSERT_EQ(1, uv_is_writable((uv_stream_t*) &channel));
+  ASSERT_OK(uv_is_closing((uv_handle_t*) &channel));
+
+  buf = uv_buf_init("hello\n", 6);
+
+  r = uv_tcp_init(uv_default_loop(), &tcp_server);
+  ASSERT_OK(r);
+  r = uv_tcp_init(uv_default_loop(), &tcp_server2);
+  ASSERT_OK(r);
+
+  r = uv_tcp_bind(&tcp_server, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+  r = uv_tcp_bind(&tcp_server2, (const struct sockaddr*) &addr, 0);
+  ASSERT_OK(r);
+
+  r = uv_write2(&write_req, (uv_stream_t*)&channel, &buf, 1,
+                (uv_stream_t*)&tcp_server, NULL);
+  ASSERT_OK(r);
+  r = uv_write2(&write_req2, (uv_stream_t*)&channel, &buf, 1,
+                (uv_stream_t*)&tcp_server2, NULL);
+  ASSERT_OK(r);
+
+  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}
+
+int ipc_helper_send_zero(void) {
+  int r;
+  uv_buf_t zero_buf;
+
+  zero_buf = uv_buf_init(0, 0);
+
+  r = uv_pipe_init(uv_default_loop(), &channel, 0);
+  ASSERT_OK(r);
+
+  uv_pipe_open(&channel, 0);
+
+  ASSERT_EQ(1, uv_is_readable((uv_stream_t*) &channel));
+  ASSERT_EQ(1, uv_is_writable((uv_stream_t*) &channel));
+  ASSERT_OK(uv_is_closing((uv_handle_t*) &channel));
+
+  r = uv_write(&write_req,
+               (uv_stream_t*)&channel,
+               &zero_buf,
+               1,
+               send_zero_write_cb);
+
+  ASSERT_OK(r);
+
+  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+  ASSERT_OK(r);
+
+  ASSERT_EQ(1, send_zero_write);
+
+  MAKE_VALGRIND_HAPPY(uv_default_loop());
+  return 0;
+}