--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/src/unix/stream.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,1567 @@
+/* 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 "internal.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <limits.h> /* IOV_MAX */
+
+#if defined(__APPLE__)
+# include <sys/event.h>
+# include <sys/time.h>
+# include <sys/select.h>
+
+/* Forward declaration */
+typedef struct uv__stream_select_s uv__stream_select_t;
+
+struct uv__stream_select_s {
+  uv_stream_t* stream;
+  uv_thread_t thread;
+  uv_sem_t close_sem;
+  uv_sem_t async_sem;
+  uv_async_t async;
+  int events;
+  int fake_fd;
+  int int_fd;
+  int fd;
+  fd_set* sread;
+  size_t sread_sz;
+  fd_set* swrite;
+  size_t swrite_sz;
+};
+#endif /* defined(__APPLE__) */
+
+union uv__cmsg {
+  struct cmsghdr hdr;
+  /* This cannot be larger because of the IBMi PASE limitation that
+   * the total size of control messages cannot exceed 256 bytes.
+   */
+  char pad[256];
+};
+
+STATIC_ASSERT(256 == sizeof(union uv__cmsg));
+
+static void uv__stream_connect(uv_stream_t*);
+static void uv__write(uv_stream_t* stream);
+static void uv__read(uv_stream_t* stream);
+static void uv__stream_io(uv_loop_t* loop, uv__io_t* w, unsigned int events);
+static void uv__write_callbacks(uv_stream_t* stream);
+static size_t uv__write_req_size(uv_write_t* req);
+static void uv__drain(uv_stream_t* stream);
+
+
+void uv__stream_init(uv_loop_t* loop,
+                     uv_stream_t* stream,
+                     uv_handle_type type) {
+  int err;
+
+  uv__handle_init(loop, (uv_handle_t*)stream, type);
+  stream->read_cb = NULL;
+  stream->alloc_cb = NULL;
+  stream->close_cb = NULL;
+  stream->connection_cb = NULL;
+  stream->connect_req = NULL;
+  stream->shutdown_req = NULL;
+  stream->accepted_fd = -1;
+  stream->queued_fds = NULL;
+  stream->delayed_error = 0;
+  uv__queue_init(&stream->write_queue);
+  uv__queue_init(&stream->write_completed_queue);
+  stream->write_queue_size = 0;
+
+  if (loop->emfile_fd == -1) {
+    err = uv__open_cloexec("/dev/null", O_RDONLY);
+    if (err < 0)
+        /* In the rare case that "/dev/null" isn't mounted open "/"
+         * instead.
+         */
+        err = uv__open_cloexec("/", O_RDONLY);
+    if (err >= 0)
+      loop->emfile_fd = err;
+  }
+
+#if defined(__APPLE__)
+  stream->select = NULL;
+#endif /* defined(__APPLE_) */
+
+  uv__io_init(&stream->io_watcher, uv__stream_io, -1);
+}
+
+
+static void uv__stream_osx_interrupt_select(uv_stream_t* stream) {
+#if defined(__APPLE__)
+  /* Notify select() thread about state change */
+  uv__stream_select_t* s;
+  int r;
+
+  s = stream->select;
+  if (s == NULL)
+    return;
+
+  /* Interrupt select() loop
+   * NOTE: fake_fd and int_fd are socketpair(), thus writing to one will
+   * emit read event on other side
+   */
+  do
+    r = write(s->fake_fd, "x", 1);
+  while (r == -1 && errno == EINTR);
+
+  assert(r == 1);
+#else  /* !defined(__APPLE__) */
+  /* No-op on any other platform */
+#endif  /* !defined(__APPLE__) */
+}
+
+
+#if defined(__APPLE__)
+static void uv__stream_osx_select(void* arg) {
+  uv_stream_t* stream;
+  uv__stream_select_t* s;
+  char buf[1024];
+  int events;
+  int fd;
+  int r;
+  int max_fd;
+
+  stream = arg;
+  s = stream->select;
+  fd = s->fd;
+
+  if (fd > s->int_fd)
+    max_fd = fd;
+  else
+    max_fd = s->int_fd;
+
+  for (;;) {
+    /* Terminate on semaphore */
+    if (uv_sem_trywait(&s->close_sem) == 0)
+      break;
+
+    /* Watch fd using select(2) */
+    memset(s->sread, 0, s->sread_sz);
+    memset(s->swrite, 0, s->swrite_sz);
+
+    if (uv__io_active(&stream->io_watcher, POLLIN))
+      FD_SET(fd, s->sread);
+    if (uv__io_active(&stream->io_watcher, POLLOUT))
+      FD_SET(fd, s->swrite);
+    FD_SET(s->int_fd, s->sread);
+
+    /* Wait indefinitely for fd events */
+    r = select(max_fd + 1, s->sread, s->swrite, NULL, NULL);
+    if (r == -1) {
+      if (errno == EINTR)
+        continue;
+
+      /* XXX: Possible?! */
+      abort();
+    }
+
+    /* Ignore timeouts */
+    if (r == 0)
+      continue;
+
+    /* Empty socketpair's buffer in case of interruption */
+    if (FD_ISSET(s->int_fd, s->sread))
+      for (;;) {
+        r = read(s->int_fd, buf, sizeof(buf));
+
+        if (r == sizeof(buf))
+          continue;
+
+        if (r != -1)
+          break;
+
+        if (errno == EAGAIN || errno == EWOULDBLOCK)
+          break;
+
+        if (errno == EINTR)
+          continue;
+
+        abort();
+      }
+
+    /* Handle events */
+    events = 0;
+    if (FD_ISSET(fd, s->sread))
+      events |= POLLIN;
+    if (FD_ISSET(fd, s->swrite))
+      events |= POLLOUT;
+
+    assert(events != 0 || FD_ISSET(s->int_fd, s->sread));
+    if (events != 0) {
+      ACCESS_ONCE(int, s->events) = events;
+
+      uv_async_send(&s->async);
+      uv_sem_wait(&s->async_sem);
+
+      /* Should be processed at this stage */
+      assert((s->events == 0) || (stream->flags & UV_HANDLE_CLOSING));
+    }
+  }
+}
+
+
+static void uv__stream_osx_select_cb(uv_async_t* handle) {
+  uv__stream_select_t* s;
+  uv_stream_t* stream;
+  int events;
+
+  s = container_of(handle, uv__stream_select_t, async);
+  stream = s->stream;
+
+  /* Get and reset stream's events */
+  events = s->events;
+  ACCESS_ONCE(int, s->events) = 0;
+
+  assert(events != 0);
+  assert(events == (events & (POLLIN | POLLOUT)));
+
+  /* Invoke callback on event-loop */
+  if ((events & POLLIN) && uv__io_active(&stream->io_watcher, POLLIN))
+    uv__stream_io(stream->loop, &stream->io_watcher, POLLIN);
+
+  if ((events & POLLOUT) && uv__io_active(&stream->io_watcher, POLLOUT))
+    uv__stream_io(stream->loop, &stream->io_watcher, POLLOUT);
+
+  if (stream->flags & UV_HANDLE_CLOSING)
+    return;
+
+  /* NOTE: It is important to do it here, otherwise `select()` might be called
+   * before the actual `uv__read()`, leading to the blocking syscall
+   */
+  uv_sem_post(&s->async_sem);
+}
+
+
+static void uv__stream_osx_cb_close(uv_handle_t* async) {
+  uv__stream_select_t* s;
+
+  s = container_of(async, uv__stream_select_t, async);
+  uv__free(s);
+}
+
+
+int uv__stream_try_select(uv_stream_t* stream, int* fd) {
+  /*
+   * kqueue doesn't work with some files from /dev mount on osx.
+   * select(2) in separate thread for those fds
+   */
+
+  struct kevent filter[1];
+  struct kevent events[1];
+  struct timespec timeout;
+  uv__stream_select_t* s;
+  int fds[2];
+  int err;
+  int ret;
+  int kq;
+  int old_fd;
+  int max_fd;
+  size_t sread_sz;
+  size_t swrite_sz;
+
+  kq = kqueue();
+  if (kq == -1) {
+    perror("(libuv) kqueue()");
+    return UV__ERR(errno);
+  }
+
+  EV_SET(&filter[0], *fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 0);
+
+  /* Use small timeout, because we only want to capture EINVALs */
+  timeout.tv_sec = 0;
+  timeout.tv_nsec = 1;
+
+  do
+    ret = kevent(kq, filter, 1, events, 1, &timeout);
+  while (ret == -1 && errno == EINTR);
+
+  uv__close(kq);
+
+  if (ret == -1)
+    return UV__ERR(errno);
+
+  if (ret == 0 || (events[0].flags & EV_ERROR) == 0 || events[0].data != EINVAL)
+    return 0;
+
+  /* At this point we definitely know that this fd won't work with kqueue */
+
+  /*
+   * Create fds for io watcher and to interrupt the select() loop.
+   * NOTE: do it ahead of malloc below to allocate enough space for fd_sets
+   */
+  if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds))
+    return UV__ERR(errno);
+
+  max_fd = *fd;
+  if (fds[1] > max_fd)
+    max_fd = fds[1];
+
+  sread_sz = ROUND_UP(max_fd + 1, sizeof(uint32_t) * NBBY) / NBBY;
+  swrite_sz = sread_sz;
+
+  s = uv__malloc(sizeof(*s) + sread_sz + swrite_sz);
+  if (s == NULL) {
+    err = UV_ENOMEM;
+    goto failed_malloc;
+  }
+
+  s->events = 0;
+  s->fd = *fd;
+  s->sread = (fd_set*) ((char*) s + sizeof(*s));
+  s->sread_sz = sread_sz;
+  s->swrite = (fd_set*) ((char*) s->sread + sread_sz);
+  s->swrite_sz = swrite_sz;
+
+  err = uv_async_init(stream->loop, &s->async, uv__stream_osx_select_cb);
+  if (err)
+    goto failed_async_init;
+
+  s->async.flags |= UV_HANDLE_INTERNAL;
+  uv__handle_unref(&s->async);
+
+  err = uv_sem_init(&s->close_sem, 0);
+  if (err != 0)
+    goto failed_close_sem_init;
+
+  err = uv_sem_init(&s->async_sem, 0);
+  if (err != 0)
+    goto failed_async_sem_init;
+
+  s->fake_fd = fds[0];
+  s->int_fd = fds[1];
+
+  old_fd = *fd;
+  s->stream = stream;
+  stream->select = s;
+  *fd = s->fake_fd;
+
+  err = uv_thread_create(&s->thread, uv__stream_osx_select, stream);
+  if (err != 0)
+    goto failed_thread_create;
+
+  return 0;
+
+failed_thread_create:
+  s->stream = NULL;
+  stream->select = NULL;
+  *fd = old_fd;
+
+  uv_sem_destroy(&s->async_sem);
+
+failed_async_sem_init:
+  uv_sem_destroy(&s->close_sem);
+
+failed_close_sem_init:
+  uv__close(fds[0]);
+  uv__close(fds[1]);
+  uv_close((uv_handle_t*) &s->async, uv__stream_osx_cb_close);
+  return err;
+
+failed_async_init:
+  uv__free(s);
+
+failed_malloc:
+  uv__close(fds[0]);
+  uv__close(fds[1]);
+
+  return err;
+}
+#endif /* defined(__APPLE__) */
+
+
+int uv__stream_open(uv_stream_t* stream, int fd, int flags) {
+#if defined(__APPLE__)
+  int enable;
+#endif
+
+  if (!(stream->io_watcher.fd == -1 || stream->io_watcher.fd == fd))
+    return UV_EBUSY;
+
+  assert(fd >= 0);
+  stream->flags |= flags;
+
+  if (stream->type == UV_TCP) {
+    if ((stream->flags & UV_HANDLE_TCP_NODELAY) && uv__tcp_nodelay(fd, 1))
+      return UV__ERR(errno);
+
+    /* TODO Use delay the user passed in. */
+    if ((stream->flags & UV_HANDLE_TCP_KEEPALIVE) &&
+        uv__tcp_keepalive(fd, 1, 60)) {
+      return UV__ERR(errno);
+    }
+  }
+
+#if defined(__APPLE__)
+  enable = 1;
+  if (setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &enable, sizeof(enable)) &&
+      errno != ENOTSOCK &&
+      errno != EINVAL) {
+    return UV__ERR(errno);
+  }
+#endif
+
+  stream->io_watcher.fd = fd;
+
+  return 0;
+}
+
+
+void uv__stream_flush_write_queue(uv_stream_t* stream, int error) {
+  uv_write_t* req;
+  struct uv__queue* q;
+  while (!uv__queue_empty(&stream->write_queue)) {
+    q = uv__queue_head(&stream->write_queue);
+    uv__queue_remove(q);
+
+    req = uv__queue_data(q, uv_write_t, queue);
+    req->error = error;
+
+    uv__queue_insert_tail(&stream->write_completed_queue, &req->queue);
+  }
+}
+
+
+void uv__stream_destroy(uv_stream_t* stream) {
+  assert(!uv__io_active(&stream->io_watcher, POLLIN | POLLOUT));
+  assert(stream->flags & UV_HANDLE_CLOSED);
+
+  if (stream->connect_req) {
+    uv__req_unregister(stream->loop);
+    stream->connect_req->cb(stream->connect_req, UV_ECANCELED);
+    stream->connect_req = NULL;
+  }
+
+  uv__stream_flush_write_queue(stream, UV_ECANCELED);
+  uv__write_callbacks(stream);
+  uv__drain(stream);
+
+  assert(stream->write_queue_size == 0);
+}
+
+
+/* Implements a best effort approach to mitigating accept() EMFILE errors.
+ * We have a spare file descriptor stashed away that we close to get below
+ * the EMFILE limit. Next, we accept all pending connections and close them
+ * immediately to signal the clients that we're overloaded - and we are, but
+ * we still keep on trucking.
+ *
+ * There is one caveat: it's not reliable in a multi-threaded environment.
+ * The file descriptor limit is per process. Our party trick fails if another
+ * thread opens a file or creates a socket in the time window between us
+ * calling close() and accept().
+ */
+static int uv__emfile_trick(uv_loop_t* loop, int accept_fd) {
+  int err;
+  int emfile_fd;
+
+  if (loop->emfile_fd == -1)
+    return UV_EMFILE;
+
+  uv__close(loop->emfile_fd);
+  loop->emfile_fd = -1;
+
+  do {
+    err = uv__accept(accept_fd);
+    if (err >= 0)
+      uv__close(err);
+  } while (err >= 0 || err == UV_EINTR);
+
+  emfile_fd = uv__open_cloexec("/", O_RDONLY);
+  if (emfile_fd >= 0)
+    loop->emfile_fd = emfile_fd;
+
+  return err;
+}
+
+
+void uv__server_io(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
+  uv_stream_t* stream;
+  int err;
+  int fd;
+
+  stream = container_of(w, uv_stream_t, io_watcher);
+  assert(events & POLLIN);
+  assert(stream->accepted_fd == -1);
+  assert(!(stream->flags & UV_HANDLE_CLOSING));
+
+  fd = uv__stream_fd(stream);
+  err = uv__accept(fd);
+
+  if (err == UV_EMFILE || err == UV_ENFILE)
+    err = uv__emfile_trick(loop, fd);  /* Shed load. */
+
+  if (err < 0)
+    return;
+
+  stream->accepted_fd = err;
+  stream->connection_cb(stream, 0);
+
+  if (stream->accepted_fd != -1)
+    /* The user hasn't yet accepted called uv_accept() */
+    uv__io_stop(loop, &stream->io_watcher, POLLIN);
+}
+
+
+int uv_accept(uv_stream_t* server, uv_stream_t* client) {
+  int err;
+
+  assert(server->loop == client->loop);
+
+  if (server->accepted_fd == -1)
+    return UV_EAGAIN;
+
+  switch (client->type) {
+    case UV_NAMED_PIPE:
+    case UV_TCP:
+      err = uv__stream_open(client,
+                            server->accepted_fd,
+                            UV_HANDLE_READABLE | UV_HANDLE_WRITABLE);
+      if (err) {
+        /* TODO handle error */
+        uv__close(server->accepted_fd);
+        goto done;
+      }
+      break;
+
+    case UV_UDP:
+      err = uv_udp_open((uv_udp_t*) client, server->accepted_fd);
+      if (err) {
+        uv__close(server->accepted_fd);
+        goto done;
+      }
+      break;
+
+    default:
+      return UV_EINVAL;
+  }
+
+  client->flags |= UV_HANDLE_BOUND;
+
+done:
+  /* Process queued fds */
+  if (server->queued_fds != NULL) {
+    uv__stream_queued_fds_t* queued_fds;
+
+    queued_fds = server->queued_fds;
+
+    /* Read first */
+    server->accepted_fd = queued_fds->fds[0];
+
+    /* All read, free */
+    assert(queued_fds->offset > 0);
+    if (--queued_fds->offset == 0) {
+      uv__free(queued_fds);
+      server->queued_fds = NULL;
+    } else {
+      /* Shift rest */
+      memmove(queued_fds->fds,
+              queued_fds->fds + 1,
+              queued_fds->offset * sizeof(*queued_fds->fds));
+    }
+  } else {
+    server->accepted_fd = -1;
+    if (err == 0)
+      uv__io_start(server->loop, &server->io_watcher, POLLIN);
+  }
+  return err;
+}
+
+
+int uv_listen(uv_stream_t* stream, int backlog, uv_connection_cb cb) {
+  int err;
+  if (uv__is_closing(stream)) {
+    return UV_EINVAL;
+  }
+  switch (stream->type) {
+  case UV_TCP:
+    err = uv__tcp_listen((uv_tcp_t*)stream, backlog, cb);
+    break;
+
+  case UV_NAMED_PIPE:
+    err = uv__pipe_listen((uv_pipe_t*)stream, backlog, cb);
+    break;
+
+  default:
+    err = UV_EINVAL;
+  }
+
+  if (err == 0)
+    uv__handle_start(stream);
+
+  return err;
+}
+
+
+static void uv__drain(uv_stream_t* stream) {
+  uv_shutdown_t* req;
+  int err;
+
+  assert(uv__queue_empty(&stream->write_queue));
+  if (!(stream->flags & UV_HANDLE_CLOSING)) {
+    uv__io_stop(stream->loop, &stream->io_watcher, POLLOUT);
+    uv__stream_osx_interrupt_select(stream);
+  }
+
+  if (!uv__is_stream_shutting(stream))
+    return;
+
+  req = stream->shutdown_req;
+  assert(req);
+
+  if ((stream->flags & UV_HANDLE_CLOSING) ||
+      !(stream->flags & UV_HANDLE_SHUT)) {
+    stream->shutdown_req = NULL;
+    uv__req_unregister(stream->loop);
+
+    err = 0;
+    if (stream->flags & UV_HANDLE_CLOSING)
+      /* The user destroyed the stream before we got to do the shutdown. */
+      err = UV_ECANCELED;
+    else if (shutdown(uv__stream_fd(stream), SHUT_WR))
+      err = UV__ERR(errno);
+    else /* Success. */
+      stream->flags |= UV_HANDLE_SHUT;
+
+    if (req->cb != NULL)
+      req->cb(req, err);
+  }
+}
+
+
+static ssize_t uv__writev(int fd, struct iovec* vec, size_t n) {
+  if (n == 1)
+    return write(fd, vec->iov_base, vec->iov_len);
+  else
+    return writev(fd, vec, n);
+}
+
+
+static size_t uv__write_req_size(uv_write_t* req) {
+  size_t size;
+
+  assert(req->bufs != NULL);
+  size = uv__count_bufs(req->bufs + req->write_index,
+                        req->nbufs - req->write_index);
+  assert(req->handle->write_queue_size >= size);
+
+  return size;
+}
+
+
+/* Returns 1 if all write request data has been written, or 0 if there is still
+ * more data to write.
+ *
+ * Note: the return value only says something about the *current* request.
+ * There may still be other write requests sitting in the queue.
+ */
+static int uv__write_req_update(uv_stream_t* stream,
+                                uv_write_t* req,
+                                size_t n) {
+  uv_buf_t* buf;
+  size_t len;
+
+  assert(n <= stream->write_queue_size);
+  stream->write_queue_size -= n;
+
+  buf = req->bufs + req->write_index;
+
+  do {
+    len = n < buf->len ? n : buf->len;
+    if (buf->len != 0)
+      buf->base += len;
+    buf->len -= len;
+    buf += (buf->len == 0);  /* Advance to next buffer if this one is empty. */
+    n -= len;
+  } while (n > 0);
+
+  req->write_index = buf - req->bufs;
+
+  return req->write_index == req->nbufs;
+}
+
+
+static void uv__write_req_finish(uv_write_t* req) {
+  uv_stream_t* stream = req->handle;
+
+  /* Pop the req off tcp->write_queue. */
+  uv__queue_remove(&req->queue);
+
+  /* Only free when there was no error. On error, we touch up write_queue_size
+   * right before making the callback. The reason we don't do that right away
+   * is that a write_queue_size > 0 is our only way to signal to the user that
+   * they should stop writing - which they should if we got an error. Something
+   * to revisit in future revisions of the libuv API.
+   */
+  if (req->error == 0) {
+    if (req->bufs != req->bufsml)
+      uv__free(req->bufs);
+    req->bufs = NULL;
+  }
+
+  /* Add it to the write_completed_queue where it will have its
+   * callback called in the near future.
+   */
+  uv__queue_insert_tail(&stream->write_completed_queue, &req->queue);
+  uv__io_feed(stream->loop, &stream->io_watcher);
+}
+
+
+static int uv__handle_fd(uv_handle_t* handle) {
+  switch (handle->type) {
+    case UV_NAMED_PIPE:
+    case UV_TCP:
+      return ((uv_stream_t*) handle)->io_watcher.fd;
+
+    case UV_UDP:
+      return ((uv_udp_t*) handle)->io_watcher.fd;
+
+    default:
+      return -1;
+  }
+}
+
+static int uv__try_write(uv_stream_t* stream,
+                         const uv_buf_t bufs[],
+                         unsigned int nbufs,
+                         uv_stream_t* send_handle) {
+  struct iovec* iov;
+  int iovmax;
+  int iovcnt;
+  ssize_t n;
+
+  /*
+   * Cast to iovec. We had to have our own uv_buf_t instead of iovec
+   * because Windows's WSABUF is not an iovec.
+   */
+  iov = (struct iovec*) bufs;
+  iovcnt = nbufs;
+
+  iovmax = uv__getiovmax();
+
+  /* Limit iov count to avoid EINVALs from writev() */
+  if (iovcnt > iovmax)
+    iovcnt = iovmax;
+
+  /*
+   * Now do the actual writev. Note that we've been updating the pointers
+   * inside the iov each time we write. So there is no need to offset it.
+   */
+  if (send_handle != NULL) {
+    int fd_to_send;
+    struct msghdr msg;
+    union uv__cmsg cmsg;
+
+    if (uv__is_closing(send_handle))
+      return UV_EBADF;
+
+    fd_to_send = uv__handle_fd((uv_handle_t*) send_handle);
+
+    memset(&cmsg, 0, sizeof(cmsg));
+
+    assert(fd_to_send >= 0);
+
+    msg.msg_name = NULL;
+    msg.msg_namelen = 0;
+    msg.msg_iov = iov;
+    msg.msg_iovlen = iovcnt;
+    msg.msg_flags = 0;
+
+    msg.msg_control = &cmsg.hdr;
+    msg.msg_controllen = CMSG_SPACE(sizeof(fd_to_send));
+
+    cmsg.hdr.cmsg_level = SOL_SOCKET;
+    cmsg.hdr.cmsg_type = SCM_RIGHTS;
+    cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(fd_to_send));
+    memcpy(CMSG_DATA(&cmsg.hdr), &fd_to_send, sizeof(fd_to_send));
+
+    do
+      n = sendmsg(uv__stream_fd(stream), &msg, 0);
+    while (n == -1 && errno == EINTR);
+  } else {
+    do
+      n = uv__writev(uv__stream_fd(stream), iov, iovcnt);
+    while (n == -1 && errno == EINTR);
+  }
+
+  if (n >= 0)
+    return n;
+
+  if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ENOBUFS)
+    return UV_EAGAIN;
+
+#ifdef __APPLE__
+  /* macOS versions 10.10 and 10.15 - and presumbaly 10.11 to 10.14, too -
+   * have a bug where a race condition causes the kernel to return EPROTOTYPE
+   * because the socket isn't fully constructed. It's probably the result of
+   * the peer closing the connection and that is why libuv translates it to
+   * ECONNRESET. Previously, libuv retried until the EPROTOTYPE error went
+   * away but some VPN software causes the same behavior except the error is
+   * permanent, not transient, turning the retry mechanism into an infinite
+   * loop. See https://github.com/libuv/libuv/pull/482.
+   */
+  if (errno == EPROTOTYPE)
+    return UV_ECONNRESET;
+#endif  /* __APPLE__ */
+
+  return UV__ERR(errno);
+}
+
+static void uv__write(uv_stream_t* stream) {
+  struct uv__queue* q;
+  uv_write_t* req;
+  ssize_t n;
+  int count;
+
+  assert(uv__stream_fd(stream) >= 0);
+
+  /* Prevent loop starvation when the consumer of this stream read as fast as
+   * (or faster than) we can write it. This `count` mechanism does not need to
+   * change even if we switch to edge-triggered I/O.
+   */
+  count = 32;
+
+  for (;;) {
+    if (uv__queue_empty(&stream->write_queue))
+      return;
+
+    q = uv__queue_head(&stream->write_queue);
+    req = uv__queue_data(q, uv_write_t, queue);
+    assert(req->handle == stream);
+
+    n = uv__try_write(stream,
+                      &(req->bufs[req->write_index]),
+                      req->nbufs - req->write_index,
+                      req->send_handle);
+
+    /* Ensure the handle isn't sent again in case this is a partial write. */
+    if (n >= 0) {
+      req->send_handle = NULL;
+      if (uv__write_req_update(stream, req, n)) {
+        uv__write_req_finish(req);
+        if (count-- > 0)
+          continue; /* Start trying to write the next request. */
+
+        return;
+      }
+    } else if (n != UV_EAGAIN)
+      goto error;
+
+    /* If this is a blocking stream, try again. */
+    if (stream->flags & UV_HANDLE_BLOCKING_WRITES)
+      continue;
+
+    /* We're not done. */
+    uv__io_start(stream->loop, &stream->io_watcher, POLLOUT);
+
+    /* Notify select() thread about state change */
+    uv__stream_osx_interrupt_select(stream);
+
+    return;
+  }
+
+error:
+  req->error = n;
+  uv__write_req_finish(req);
+  uv__io_stop(stream->loop, &stream->io_watcher, POLLOUT);
+  uv__stream_osx_interrupt_select(stream);
+}
+
+
+static void uv__write_callbacks(uv_stream_t* stream) {
+  uv_write_t* req;
+  struct uv__queue* q;
+  struct uv__queue pq;
+
+  if (uv__queue_empty(&stream->write_completed_queue))
+    return;
+
+  uv__queue_move(&stream->write_completed_queue, &pq);
+
+  while (!uv__queue_empty(&pq)) {
+    /* Pop a req off write_completed_queue. */
+    q = uv__queue_head(&pq);
+    req = uv__queue_data(q, uv_write_t, queue);
+    uv__queue_remove(q);
+    uv__req_unregister(stream->loop);
+
+    if (req->bufs != NULL) {
+      stream->write_queue_size -= uv__write_req_size(req);
+      if (req->bufs != req->bufsml)
+        uv__free(req->bufs);
+      req->bufs = NULL;
+    }
+
+    /* NOTE: call callback AFTER freeing the request data. */
+    if (req->cb)
+      req->cb(req, req->error);
+  }
+}
+
+
+static void uv__stream_eof(uv_stream_t* stream, const uv_buf_t* buf) {
+  stream->flags |= UV_HANDLE_READ_EOF;
+  stream->flags &= ~UV_HANDLE_READING;
+  uv__io_stop(stream->loop, &stream->io_watcher, POLLIN);
+  uv__handle_stop(stream);
+  uv__stream_osx_interrupt_select(stream);
+  stream->read_cb(stream, UV_EOF, buf);
+}
+
+
+static int uv__stream_queue_fd(uv_stream_t* stream, int fd) {
+  uv__stream_queued_fds_t* queued_fds;
+  unsigned int queue_size;
+
+  queued_fds = stream->queued_fds;
+  if (queued_fds == NULL) {
+    queue_size = 8;
+    queued_fds = uv__malloc((queue_size - 1) * sizeof(*queued_fds->fds) +
+                            sizeof(*queued_fds));
+    if (queued_fds == NULL)
+      return UV_ENOMEM;
+    queued_fds->size = queue_size;
+    queued_fds->offset = 0;
+    stream->queued_fds = queued_fds;
+
+    /* Grow */
+  } else if (queued_fds->size == queued_fds->offset) {
+    queue_size = queued_fds->size + 8;
+    queued_fds = uv__realloc(queued_fds,
+                             (queue_size - 1) * sizeof(*queued_fds->fds) +
+                              sizeof(*queued_fds));
+
+    /*
+     * Allocation failure, report back.
+     * NOTE: if it is fatal - sockets will be closed in uv__stream_close
+     */
+    if (queued_fds == NULL)
+      return UV_ENOMEM;
+    queued_fds->size = queue_size;
+    stream->queued_fds = queued_fds;
+  }
+
+  /* Put fd in a queue */
+  queued_fds->fds[queued_fds->offset++] = fd;
+
+  return 0;
+}
+
+
+static int uv__stream_recv_cmsg(uv_stream_t* stream, struct msghdr* msg) {
+  struct cmsghdr* cmsg;
+  char* p;
+  char* pe;
+  int fd;
+  int err;
+  size_t count;
+
+  err = 0;
+  for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+    if (cmsg->cmsg_type != SCM_RIGHTS) {
+      fprintf(stderr, "ignoring non-SCM_RIGHTS ancillary data: %d\n",
+          cmsg->cmsg_type);
+      continue;
+    }
+
+    assert(cmsg->cmsg_len >= CMSG_LEN(0));
+    count = cmsg->cmsg_len - CMSG_LEN(0);
+    assert(count % sizeof(fd) == 0);
+    count /= sizeof(fd);
+
+    p = (void*) CMSG_DATA(cmsg);
+    pe = p + count * sizeof(fd);
+
+    while (p < pe) {
+      memcpy(&fd, p, sizeof(fd));
+      p += sizeof(fd);
+
+      if (err == 0) {
+        if (stream->accepted_fd == -1)
+          stream->accepted_fd = fd;
+        else
+          err = uv__stream_queue_fd(stream, fd);
+      }
+
+      if (err != 0)
+        uv__close(fd);
+    }
+  }
+
+  return err;
+}
+
+
+static void uv__read(uv_stream_t* stream) {
+  uv_buf_t buf;
+  ssize_t nread;
+  struct msghdr msg;
+  union uv__cmsg cmsg;
+  int count;
+  int err;
+  int is_ipc;
+
+  stream->flags &= ~UV_HANDLE_READ_PARTIAL;
+
+  /* Prevent loop starvation when the data comes in as fast as (or faster than)
+   * we can read it. XXX Need to rearm fd if we switch to edge-triggered I/O.
+   */
+  count = 32;
+
+  is_ipc = stream->type == UV_NAMED_PIPE && ((uv_pipe_t*) stream)->ipc;
+
+  /* XXX: Maybe instead of having UV_HANDLE_READING we just test if
+   * tcp->read_cb is NULL or not?
+   */
+  while (stream->read_cb
+      && (stream->flags & UV_HANDLE_READING)
+      && (count-- > 0)) {
+    assert(stream->alloc_cb != NULL);
+
+    buf = uv_buf_init(NULL, 0);
+    stream->alloc_cb((uv_handle_t*)stream, 64 * 1024, &buf);
+    if (buf.base == NULL || buf.len == 0) {
+      /* User indicates it can't or won't handle the read. */
+      stream->read_cb(stream, UV_ENOBUFS, &buf);
+      return;
+    }
+
+    assert(buf.base != NULL);
+    assert(uv__stream_fd(stream) >= 0);
+
+    if (!is_ipc) {
+      do {
+        nread = read(uv__stream_fd(stream), buf.base, buf.len);
+      }
+      while (nread < 0 && errno == EINTR);
+    } else {
+      /* ipc uses recvmsg */
+      msg.msg_flags = 0;
+      msg.msg_iov = (struct iovec*) &buf;
+      msg.msg_iovlen = 1;
+      msg.msg_name = NULL;
+      msg.msg_namelen = 0;
+      /* Set up to receive a descriptor even if one isn't in the message */
+      msg.msg_controllen = sizeof(cmsg);
+      msg.msg_control = &cmsg.hdr;
+
+      do {
+        nread = uv__recvmsg(uv__stream_fd(stream), &msg, 0);
+      }
+      while (nread < 0 && errno == EINTR);
+    }
+
+    if (nread < 0) {
+      /* Error */
+      if (errno == EAGAIN || errno == EWOULDBLOCK) {
+        /* Wait for the next one. */
+        if (stream->flags & UV_HANDLE_READING) {
+          uv__io_start(stream->loop, &stream->io_watcher, POLLIN);
+          uv__stream_osx_interrupt_select(stream);
+        }
+        stream->read_cb(stream, 0, &buf);
+#if defined(__CYGWIN__) || defined(__MSYS__)
+      } else if (errno == ECONNRESET && stream->type == UV_NAMED_PIPE) {
+        uv__stream_eof(stream, &buf);
+        return;
+#endif
+      } else {
+        /* Error. User should call uv_close(). */
+        stream->flags &= ~(UV_HANDLE_READABLE | UV_HANDLE_WRITABLE);
+        stream->read_cb(stream, UV__ERR(errno), &buf);
+        if (stream->flags & UV_HANDLE_READING) {
+          stream->flags &= ~UV_HANDLE_READING;
+          uv__io_stop(stream->loop, &stream->io_watcher, POLLIN);
+          uv__handle_stop(stream);
+          uv__stream_osx_interrupt_select(stream);
+        }
+      }
+      return;
+    } else if (nread == 0) {
+      uv__stream_eof(stream, &buf);
+      return;
+    } else {
+      /* Successful read */
+      ssize_t buflen = buf.len;
+
+      if (is_ipc) {
+        err = uv__stream_recv_cmsg(stream, &msg);
+        if (err != 0) {
+          stream->read_cb(stream, err, &buf);
+          return;
+        }
+      }
+
+#if defined(__MVS__)
+      if (is_ipc && msg.msg_controllen > 0) {
+        uv_buf_t blankbuf;
+        int nread;
+        struct iovec *old;
+
+        blankbuf.base = 0;
+        blankbuf.len = 0;
+        old = msg.msg_iov;
+        msg.msg_iov = (struct iovec*) &blankbuf;
+        nread = 0;
+        do {
+          nread = uv__recvmsg(uv__stream_fd(stream), &msg, 0);
+          err = uv__stream_recv_cmsg(stream, &msg);
+          if (err != 0) {
+            stream->read_cb(stream, err, &buf);
+            msg.msg_iov = old;
+            return;
+          }
+        } while (nread == 0 && msg.msg_controllen > 0);
+        msg.msg_iov = old;
+      }
+#endif
+      stream->read_cb(stream, nread, &buf);
+
+      /* Return if we didn't fill the buffer, there is no more data to read. */
+      if (nread < buflen) {
+        stream->flags |= UV_HANDLE_READ_PARTIAL;
+        return;
+      }
+    }
+  }
+}
+
+
+int uv_shutdown(uv_shutdown_t* req, uv_stream_t* stream, uv_shutdown_cb cb) {
+  assert(stream->type == UV_TCP ||
+         stream->type == UV_TTY ||
+         stream->type == UV_NAMED_PIPE);
+
+  if (!(stream->flags & UV_HANDLE_WRITABLE) ||
+      stream->flags & UV_HANDLE_SHUT ||
+      uv__is_stream_shutting(stream) ||
+      uv__is_closing(stream)) {
+    return UV_ENOTCONN;
+  }
+
+  assert(uv__stream_fd(stream) >= 0);
+
+  /* Initialize request. The `shutdown(2)` call will always be deferred until
+   * `uv__drain`, just before the callback is run. */
+  uv__req_init(stream->loop, req, UV_SHUTDOWN);
+  req->handle = stream;
+  req->cb = cb;
+  stream->shutdown_req = req;
+  stream->flags &= ~UV_HANDLE_WRITABLE;
+
+  if (uv__queue_empty(&stream->write_queue))
+    uv__io_feed(stream->loop, &stream->io_watcher);
+
+  return 0;
+}
+
+
+static void uv__stream_io(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
+  uv_stream_t* stream;
+
+  stream = container_of(w, uv_stream_t, io_watcher);
+
+  assert(stream->type == UV_TCP ||
+         stream->type == UV_NAMED_PIPE ||
+         stream->type == UV_TTY);
+  assert(!(stream->flags & UV_HANDLE_CLOSING));
+
+  if (stream->connect_req) {
+    uv__stream_connect(stream);
+    return;
+  }
+
+  assert(uv__stream_fd(stream) >= 0);
+
+  /* Ignore POLLHUP here. Even if it's set, there may still be data to read. */
+  if (events & (POLLIN | POLLERR | POLLHUP))
+    uv__read(stream);
+
+  if (uv__stream_fd(stream) == -1)
+    return;  /* read_cb closed stream. */
+
+  /* Short-circuit iff POLLHUP is set, the user is still interested in read
+   * events and uv__read() reported a partial read but not EOF. If the EOF
+   * flag is set, uv__read() called read_cb with err=UV_EOF and we don't
+   * have to do anything. If the partial read flag is not set, we can't
+   * report the EOF yet because there is still data to read.
+   */
+  if ((events & POLLHUP) &&
+      (stream->flags & UV_HANDLE_READING) &&
+      (stream->flags & UV_HANDLE_READ_PARTIAL) &&
+      !(stream->flags & UV_HANDLE_READ_EOF)) {
+    uv_buf_t buf = { NULL, 0 };
+    uv__stream_eof(stream, &buf);
+  }
+
+  if (uv__stream_fd(stream) == -1)
+    return;  /* read_cb closed stream. */
+
+  if (events & (POLLOUT | POLLERR | POLLHUP)) {
+    uv__write(stream);
+    uv__write_callbacks(stream);
+
+    /* Write queue drained. */
+    if (uv__queue_empty(&stream->write_queue))
+      uv__drain(stream);
+  }
+}
+
+
+/**
+ * We get called here from directly following a call to connect(2).
+ * In order to determine if we've errored out or succeeded must call
+ * getsockopt.
+ */
+static void uv__stream_connect(uv_stream_t* stream) {
+  int error;
+  uv_connect_t* req = stream->connect_req;
+  socklen_t errorsize = sizeof(int);
+
+  assert(stream->type == UV_TCP || stream->type == UV_NAMED_PIPE);
+  assert(req);
+
+  if (stream->delayed_error) {
+    /* To smooth over the differences between unixes errors that
+     * were reported synchronously on the first connect can be delayed
+     * until the next tick--which is now.
+     */
+    error = stream->delayed_error;
+    stream->delayed_error = 0;
+  } else {
+    /* Normal situation: we need to get the socket error from the kernel. */
+    assert(uv__stream_fd(stream) >= 0);
+    getsockopt(uv__stream_fd(stream),
+               SOL_SOCKET,
+               SO_ERROR,
+               &error,
+               &errorsize);
+    error = UV__ERR(error);
+  }
+
+  if (error == UV__ERR(EINPROGRESS))
+    return;
+
+  stream->connect_req = NULL;
+  uv__req_unregister(stream->loop);
+
+  if (error < 0 || uv__queue_empty(&stream->write_queue)) {
+    uv__io_stop(stream->loop, &stream->io_watcher, POLLOUT);
+  }
+
+  if (req->cb)
+    req->cb(req, error);
+
+  if (uv__stream_fd(stream) == -1)
+    return;
+
+  if (error < 0) {
+    uv__stream_flush_write_queue(stream, UV_ECANCELED);
+    uv__write_callbacks(stream);
+  }
+}
+
+
+static int uv__check_before_write(uv_stream_t* stream,
+                                  unsigned int nbufs,
+                                  uv_stream_t* send_handle) {
+  assert(nbufs > 0);
+  assert((stream->type == UV_TCP ||
+          stream->type == UV_NAMED_PIPE ||
+          stream->type == UV_TTY) &&
+         "uv_write (unix) does not yet support other types of streams");
+
+  if (uv__stream_fd(stream) < 0)
+    return UV_EBADF;
+
+  if (!(stream->flags & UV_HANDLE_WRITABLE))
+    return UV_EPIPE;
+
+  if (send_handle != NULL) {
+    if (stream->type != UV_NAMED_PIPE || !((uv_pipe_t*)stream)->ipc)
+      return UV_EINVAL;
+
+    /* XXX We abuse uv_write2() to send over UDP handles to child processes.
+     * Don't call uv__stream_fd() on those handles, it's a macro that on OS X
+     * evaluates to a function that operates on a uv_stream_t with a couple of
+     * OS X specific fields. On other Unices it does (handle)->io_watcher.fd,
+     * which works but only by accident.
+     */
+    if (uv__handle_fd((uv_handle_t*) send_handle) < 0)
+      return UV_EBADF;
+
+#if defined(__CYGWIN__) || defined(__MSYS__)
+    /* Cygwin recvmsg always sets msg_controllen to zero, so we cannot send it.
+       See https://github.com/mirror/newlib-cygwin/blob/86fc4bf0/winsup/cygwin/fhandler_socket.cc#L1736-L1743 */
+    return UV_ENOSYS;
+#endif
+  }
+
+  return 0;
+}
+
+int uv_write2(uv_write_t* req,
+              uv_stream_t* stream,
+              const uv_buf_t bufs[],
+              unsigned int nbufs,
+              uv_stream_t* send_handle,
+              uv_write_cb cb) {
+  int empty_queue;
+  int err;
+
+  err = uv__check_before_write(stream, nbufs, send_handle);
+  if (err < 0)
+    return err;
+
+  /* It's legal for write_queue_size > 0 even when the write_queue is empty;
+   * it means there are error-state requests in the write_completed_queue that
+   * will touch up write_queue_size later, see also uv__write_req_finish().
+   * We could check that write_queue is empty instead but that implies making
+   * a write() syscall when we know that the handle is in error mode.
+   */
+  empty_queue = (stream->write_queue_size == 0);
+
+  /* Initialize the req */
+  uv__req_init(stream->loop, req, UV_WRITE);
+  req->cb = cb;
+  req->handle = stream;
+  req->error = 0;
+  req->send_handle = send_handle;
+  uv__queue_init(&req->queue);
+
+  req->bufs = req->bufsml;
+  if (nbufs > ARRAY_SIZE(req->bufsml))
+    req->bufs = uv__malloc(nbufs * sizeof(bufs[0]));
+
+  if (req->bufs == NULL)
+    return UV_ENOMEM;
+
+  memcpy(req->bufs, bufs, nbufs * sizeof(bufs[0]));
+  req->nbufs = nbufs;
+  req->write_index = 0;
+  stream->write_queue_size += uv__count_bufs(bufs, nbufs);
+
+  /* Append the request to write_queue. */
+  uv__queue_insert_tail(&stream->write_queue, &req->queue);
+
+  /* If the queue was empty when this function began, we should attempt to
+   * do the write immediately. Otherwise start the write_watcher and wait
+   * for the fd to become writable.
+   */
+  if (stream->connect_req) {
+    /* Still connecting, do nothing. */
+  }
+  else if (empty_queue) {
+    uv__write(stream);
+  }
+  else {
+    /*
+     * blocking streams should never have anything in the queue.
+     * if this assert fires then somehow the blocking stream isn't being
+     * sufficiently flushed in uv__write.
+     */
+    assert(!(stream->flags & UV_HANDLE_BLOCKING_WRITES));
+    uv__io_start(stream->loop, &stream->io_watcher, POLLOUT);
+    uv__stream_osx_interrupt_select(stream);
+  }
+
+  return 0;
+}
+
+
+/* The buffers to be written must remain valid until the callback is called.
+ * This is not required for the uv_buf_t array.
+ */
+int uv_write(uv_write_t* req,
+             uv_stream_t* handle,
+             const uv_buf_t bufs[],
+             unsigned int nbufs,
+             uv_write_cb cb) {
+  return uv_write2(req, handle, bufs, nbufs, NULL, cb);
+}
+
+
+int uv_try_write(uv_stream_t* stream,
+                 const uv_buf_t bufs[],
+                 unsigned int nbufs) {
+  return uv_try_write2(stream, bufs, nbufs, NULL);
+}
+
+
+int uv_try_write2(uv_stream_t* stream,
+                  const uv_buf_t bufs[],
+                  unsigned int nbufs,
+                  uv_stream_t* send_handle) {
+  int err;
+
+  /* Connecting or already writing some data */
+  if (stream->connect_req != NULL || stream->write_queue_size != 0)
+    return UV_EAGAIN;
+
+  err = uv__check_before_write(stream, nbufs, NULL);
+  if (err < 0)
+    return err;
+
+  return uv__try_write(stream, bufs, nbufs, send_handle);
+}
+
+
+int uv__read_start(uv_stream_t* stream,
+                   uv_alloc_cb alloc_cb,
+                   uv_read_cb read_cb) {
+  assert(stream->type == UV_TCP || stream->type == UV_NAMED_PIPE ||
+      stream->type == UV_TTY);
+
+  /* The UV_HANDLE_READING flag is irrelevant of the state of the stream - it
+   * just expresses the desired state of the user. */
+  stream->flags |= UV_HANDLE_READING;
+  stream->flags &= ~UV_HANDLE_READ_EOF;
+
+  /* TODO: try to do the read inline? */
+  assert(uv__stream_fd(stream) >= 0);
+  assert(alloc_cb);
+
+  stream->read_cb = read_cb;
+  stream->alloc_cb = alloc_cb;
+
+  uv__io_start(stream->loop, &stream->io_watcher, POLLIN);
+  uv__handle_start(stream);
+  uv__stream_osx_interrupt_select(stream);
+
+  return 0;
+}
+
+
+int uv_read_stop(uv_stream_t* stream) {
+  if (!(stream->flags & UV_HANDLE_READING))
+    return 0;
+
+  stream->flags &= ~UV_HANDLE_READING;
+  uv__io_stop(stream->loop, &stream->io_watcher, POLLIN);
+  uv__handle_stop(stream);
+  uv__stream_osx_interrupt_select(stream);
+
+  stream->read_cb = NULL;
+  stream->alloc_cb = NULL;
+  return 0;
+}
+
+
+int uv_is_readable(const uv_stream_t* stream) {
+  return !!(stream->flags & UV_HANDLE_READABLE);
+}
+
+
+int uv_is_writable(const uv_stream_t* stream) {
+  return !!(stream->flags & UV_HANDLE_WRITABLE);
+}
+
+
+#if defined(__APPLE__)
+int uv___stream_fd(const uv_stream_t* handle) {
+  const uv__stream_select_t* s;
+
+  assert(handle->type == UV_TCP ||
+         handle->type == UV_TTY ||
+         handle->type == UV_NAMED_PIPE);
+
+  s = handle->select;
+  if (s != NULL)
+    return s->fd;
+
+  return handle->io_watcher.fd;
+}
+#endif /* defined(__APPLE__) */
+
+
+void uv__stream_close(uv_stream_t* handle) {
+  unsigned int i;
+  uv__stream_queued_fds_t* queued_fds;
+
+#if defined(__APPLE__)
+  /* Terminate select loop first */
+  if (handle->select != NULL) {
+    uv__stream_select_t* s;
+
+    s = handle->select;
+
+    uv_sem_post(&s->close_sem);
+    uv_sem_post(&s->async_sem);
+    uv__stream_osx_interrupt_select(handle);
+    uv_thread_join(&s->thread);
+    uv_sem_destroy(&s->close_sem);
+    uv_sem_destroy(&s->async_sem);
+    uv__close(s->fake_fd);
+    uv__close(s->int_fd);
+    uv_close((uv_handle_t*) &s->async, uv__stream_osx_cb_close);
+
+    handle->select = NULL;
+  }
+#endif /* defined(__APPLE__) */
+
+  uv__io_close(handle->loop, &handle->io_watcher);
+  uv_read_stop(handle);
+  uv__handle_stop(handle);
+  handle->flags &= ~(UV_HANDLE_READABLE | UV_HANDLE_WRITABLE);
+
+  if (handle->io_watcher.fd != -1) {
+    /* Don't close stdio file descriptors.  Nothing good comes from it. */
+    if (handle->io_watcher.fd > STDERR_FILENO)
+      uv__close(handle->io_watcher.fd);
+    handle->io_watcher.fd = -1;
+  }
+
+  if (handle->accepted_fd != -1) {
+    uv__close(handle->accepted_fd);
+    handle->accepted_fd = -1;
+  }
+
+  /* Close all queued fds */
+  if (handle->queued_fds != NULL) {
+    queued_fds = handle->queued_fds;
+    for (i = 0; i < queued_fds->offset; i++)
+      uv__close(queued_fds->fds[i]);
+    uv__free(handle->queued_fds);
+    handle->queued_fds = NULL;
+  }
+
+  assert(!uv__io_active(&handle->io_watcher, POLLIN | POLLOUT));
+}
+
+
+int uv_stream_set_blocking(uv_stream_t* handle, int blocking) {
+  /* Don't need to check the file descriptor, uv__nonblock()
+   * will fail with EBADF if it's not valid.
+   */
+  return uv__nonblock(uv__stream_fd(handle), !blocking);
+}