--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/src/unix/pipe.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,555 @@
+/* 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 <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+
+/* Does the file path contain embedded nul bytes? */
+static int includes_invalid_nul(const char *s, size_t n) {
+  if (n == 0)
+    return 0;
+#ifdef __linux__
+  /* Accept abstract socket namespace paths, throughout which nul bytes have
+   * no special significance ("\0foo\0bar").
+   */
+  if (s[0] == '\0')
+    return 0;
+#endif
+  return NULL != memchr(s, '\0', n);
+}
+
+
+int uv_pipe_init(uv_loop_t* loop, uv_pipe_t* handle, int ipc) {
+  uv__stream_init(loop, (uv_stream_t*)handle, UV_NAMED_PIPE);
+  handle->shutdown_req = NULL;
+  handle->connect_req = NULL;
+  handle->pipe_fname = NULL;
+  handle->ipc = ipc;
+  return 0;
+}
+
+
+int uv_pipe_bind(uv_pipe_t* handle, const char* name) {
+  return uv_pipe_bind2(handle, name, strlen(name), 0);
+}
+
+
+int uv_pipe_bind2(uv_pipe_t* handle,
+                  const char* name,
+                  size_t namelen,
+                  unsigned int flags) {
+  struct sockaddr_un saddr;
+  char* pipe_fname;
+  int sockfd;
+  int err;
+  socklen_t addrlen;
+
+  pipe_fname = NULL;
+
+  if (flags & ~UV_PIPE_NO_TRUNCATE)
+    return UV_EINVAL;
+
+  if (name == NULL)
+    return UV_EINVAL;
+
+  /* namelen==0 on Linux means autobind the listen socket in the abstract
+   * socket namespace, see `man 7 unix` for details.
+   */
+#if !defined(__linux__)
+  if (namelen == 0)
+    return UV_EINVAL;
+#endif
+
+  if (includes_invalid_nul(name, namelen))
+    return UV_EINVAL;
+
+  if (flags & UV_PIPE_NO_TRUNCATE)
+    if (namelen > sizeof(saddr.sun_path))
+      return UV_EINVAL;
+
+  /* Truncate long paths. Documented behavior. */
+  if (namelen > sizeof(saddr.sun_path))
+    namelen = sizeof(saddr.sun_path);
+
+  /* Already bound? */
+  if (uv__stream_fd(handle) >= 0)
+    return UV_EINVAL;
+
+  if (uv__is_closing(handle))
+    return UV_EINVAL;
+
+  /* Make a copy of the file path unless it is an abstract socket.
+   * We unlink the file later but abstract sockets disappear
+   * automatically since they're not real file system entities.
+   */
+  if (*name == '\0') {
+    addrlen = offsetof(struct sockaddr_un, sun_path) + namelen;
+  } else {
+    pipe_fname = uv__malloc(namelen + 1);
+    if (pipe_fname == NULL)
+      return UV_ENOMEM;
+    memcpy(pipe_fname, name, namelen);
+    pipe_fname[namelen] = '\0';
+    addrlen = sizeof saddr;
+  }
+
+  err = uv__socket(AF_UNIX, SOCK_STREAM, 0);
+  if (err < 0)
+    goto err_socket;
+  sockfd = err;
+
+  memset(&saddr, 0, sizeof saddr);
+  memcpy(&saddr.sun_path, name, namelen);
+  saddr.sun_family = AF_UNIX;
+
+  if (bind(sockfd, (struct sockaddr*)&saddr, addrlen)) {
+    err = UV__ERR(errno);
+    /* Convert ENOENT to EACCES for compatibility with Windows. */
+    if (err == UV_ENOENT)
+      err = UV_EACCES;
+
+    uv__close(sockfd);
+    goto err_socket;
+  }
+
+  /* Success. */
+  handle->flags |= UV_HANDLE_BOUND;
+  handle->pipe_fname = pipe_fname; /* NULL or a copy of |name| */
+  handle->io_watcher.fd = sockfd;
+  return 0;
+
+err_socket:
+  uv__free(pipe_fname);
+  return err;
+}
+
+
+int uv__pipe_listen(uv_pipe_t* handle, int backlog, uv_connection_cb cb) {
+  if (uv__stream_fd(handle) == -1)
+    return UV_EINVAL;
+
+  if (handle->ipc)
+    return UV_EINVAL;
+
+#if defined(__MVS__) || defined(__PASE__)
+  /* On zOS, backlog=0 has undefined behaviour */
+  /* On IBMi PASE, backlog=0 leads to "Connection refused" error */
+  if (backlog == 0)
+    backlog = 1;
+  else if (backlog < 0)
+    backlog = SOMAXCONN;
+#endif
+
+  if (listen(uv__stream_fd(handle), backlog))
+    return UV__ERR(errno);
+
+  handle->connection_cb = cb;
+  handle->io_watcher.cb = uv__server_io;
+  uv__io_start(handle->loop, &handle->io_watcher, POLLIN);
+  return 0;
+}
+
+
+void uv__pipe_close(uv_pipe_t* handle) {
+  if (handle->pipe_fname) {
+    /*
+     * Unlink the file system entity before closing the file descriptor.
+     * Doing it the other way around introduces a race where our process
+     * unlinks a socket with the same name that's just been created by
+     * another thread or process.
+     */
+    unlink(handle->pipe_fname);
+    uv__free((void*)handle->pipe_fname);
+    handle->pipe_fname = NULL;
+  }
+
+  uv__stream_close((uv_stream_t*)handle);
+}
+
+
+int uv_pipe_open(uv_pipe_t* handle, uv_file fd) {
+  int flags;
+  int mode;
+  int err;
+  flags = 0;
+
+  if (uv__fd_exists(handle->loop, fd))
+    return UV_EEXIST;
+
+  do
+    mode = fcntl(fd, F_GETFL);
+  while (mode == -1 && errno == EINTR);
+
+  if (mode == -1)
+    return UV__ERR(errno); /* according to docs, must be EBADF */
+
+  err = uv__nonblock(fd, 1);
+  if (err)
+    return err;
+
+#if defined(__APPLE__)
+  err = uv__stream_try_select((uv_stream_t*) handle, &fd);
+  if (err)
+    return err;
+#endif /* defined(__APPLE__) */
+
+  mode &= O_ACCMODE;
+  if (mode != O_WRONLY)
+    flags |= UV_HANDLE_READABLE;
+  if (mode != O_RDONLY)
+    flags |= UV_HANDLE_WRITABLE;
+
+  return uv__stream_open((uv_stream_t*)handle, fd, flags);
+}
+
+
+void uv_pipe_connect(uv_connect_t* req,
+                    uv_pipe_t* handle,
+                    const char* name,
+                    uv_connect_cb cb) {
+  int err;
+
+  err = uv_pipe_connect2(req, handle, name, strlen(name), 0, cb);
+
+  if (err) {
+    handle->delayed_error = err;
+    handle->connect_req = req;
+
+    uv__req_init(handle->loop, req, UV_CONNECT);
+    req->handle = (uv_stream_t*) handle;
+    req->cb = cb;
+    uv__queue_init(&req->queue);
+
+    /* Force callback to run on next tick in case of error. */
+    uv__io_feed(handle->loop, &handle->io_watcher);
+  }
+}
+
+
+int uv_pipe_connect2(uv_connect_t* req,
+                     uv_pipe_t* handle,
+                     const char* name,
+                     size_t namelen,
+                     unsigned int flags,
+                     uv_connect_cb cb) {
+  struct sockaddr_un saddr;
+  int new_sock;
+  int err;
+  int r;
+  socklen_t addrlen;
+
+  if (flags & ~UV_PIPE_NO_TRUNCATE)
+    return UV_EINVAL;
+
+  if (name == NULL)
+    return UV_EINVAL;
+
+  if (namelen == 0)
+    return UV_EINVAL;
+
+  if (includes_invalid_nul(name, namelen))
+    return UV_EINVAL;
+
+  if (flags & UV_PIPE_NO_TRUNCATE)
+    if (namelen > sizeof(saddr.sun_path))
+      return UV_EINVAL;
+
+  /* Truncate long paths. Documented behavior. */
+  if (namelen > sizeof(saddr.sun_path))
+    namelen = sizeof(saddr.sun_path);
+
+  new_sock = (uv__stream_fd(handle) == -1);
+
+  if (new_sock) {
+    err = uv__socket(AF_UNIX, SOCK_STREAM, 0);
+    if (err < 0)
+      goto out;
+    handle->io_watcher.fd = err;
+  }
+
+  memset(&saddr, 0, sizeof saddr);
+  memcpy(&saddr.sun_path, name, namelen);
+  saddr.sun_family = AF_UNIX;
+
+  if (*name == '\0')
+    addrlen = offsetof(struct sockaddr_un, sun_path) + namelen;
+  else
+    addrlen = sizeof saddr;
+
+  do {
+    r = connect(uv__stream_fd(handle), (struct sockaddr*)&saddr, addrlen);
+  }
+  while (r == -1 && errno == EINTR);
+
+  if (r == -1 && errno != EINPROGRESS) {
+    err = UV__ERR(errno);
+#if defined(__CYGWIN__) || defined(__MSYS__)
+    /* EBADF is supposed to mean that the socket fd is bad, but
+       Cygwin reports EBADF instead of ENOTSOCK when the file is
+       not a socket.  We do not expect to see a bad fd here
+       (e.g. due to new_sock), so translate the error.  */
+    if (err == UV_EBADF)
+      err = UV_ENOTSOCK;
+#endif
+    goto out;
+  }
+
+  err = 0;
+  if (new_sock) {
+    err = uv__stream_open((uv_stream_t*)handle,
+                          uv__stream_fd(handle),
+                          UV_HANDLE_READABLE | UV_HANDLE_WRITABLE);
+  }
+
+  if (err == 0)
+    uv__io_start(handle->loop, &handle->io_watcher, POLLOUT);
+
+out:
+  handle->delayed_error = err;
+  handle->connect_req = req;
+
+  uv__req_init(handle->loop, req, UV_CONNECT);
+  req->handle = (uv_stream_t*) handle;
+  req->cb = cb;
+  uv__queue_init(&req->queue);
+
+  /* Force callback to run on next tick in case of error. */
+  if (err)
+    uv__io_feed(handle->loop, &handle->io_watcher);
+
+  return 0;
+}
+
+
+static int uv__pipe_getsockpeername(const uv_pipe_t* handle,
+                                    uv__peersockfunc func,
+                                    char* buffer,
+                                    size_t* size) {
+#if defined(__linux__)
+  static const int is_linux = 1;
+#else
+  static const int is_linux = 0;
+#endif
+  struct sockaddr_un sa;
+  socklen_t addrlen;
+  size_t slop;
+  char* p;
+  int err;
+
+  if (buffer == NULL || size == NULL || *size == 0)
+    return UV_EINVAL;
+
+  addrlen = sizeof(sa);
+  memset(&sa, 0, addrlen);
+  err = uv__getsockpeername((const uv_handle_t*) handle,
+                            func,
+                            (struct sockaddr*) &sa,
+                            (int*) &addrlen);
+  if (err < 0) {
+    *size = 0;
+    return err;
+  }
+
+  slop = 1;
+  if (is_linux && sa.sun_path[0] == '\0') {
+    /* Linux abstract namespace. Not zero-terminated. */
+    slop = 0;
+    addrlen -= offsetof(struct sockaddr_un, sun_path);
+  } else {
+    p = memchr(sa.sun_path, '\0', sizeof(sa.sun_path));
+    if (p == NULL)
+      p = ARRAY_END(sa.sun_path);
+    addrlen = p - sa.sun_path;
+  }
+
+  if ((size_t)addrlen + slop > *size) {
+    *size = addrlen + slop;
+    return UV_ENOBUFS;
+  }
+
+  memcpy(buffer, sa.sun_path, addrlen);
+  *size = addrlen;
+
+  /* only null-terminate if it's not an abstract socket */
+  if (buffer[0] != '\0')
+    buffer[addrlen] = '\0';
+
+  return 0;
+}
+
+
+int uv_pipe_getsockname(const uv_pipe_t* handle, char* buffer, size_t* size) {
+  return uv__pipe_getsockpeername(handle, getsockname, buffer, size);
+}
+
+
+int uv_pipe_getpeername(const uv_pipe_t* handle, char* buffer, size_t* size) {
+  return uv__pipe_getsockpeername(handle, getpeername, buffer, size);
+}
+
+
+void uv_pipe_pending_instances(uv_pipe_t* handle, int count) {
+}
+
+
+int uv_pipe_pending_count(uv_pipe_t* handle) {
+  uv__stream_queued_fds_t* queued_fds;
+
+  if (!handle->ipc)
+    return 0;
+
+  if (handle->accepted_fd == -1)
+    return 0;
+
+  if (handle->queued_fds == NULL)
+    return 1;
+
+  queued_fds = handle->queued_fds;
+  return queued_fds->offset + 1;
+}
+
+
+uv_handle_type uv_pipe_pending_type(uv_pipe_t* handle) {
+  if (!handle->ipc)
+    return UV_UNKNOWN_HANDLE;
+
+  if (handle->accepted_fd == -1)
+    return UV_UNKNOWN_HANDLE;
+  else
+    return uv_guess_handle(handle->accepted_fd);
+}
+
+
+int uv_pipe_chmod(uv_pipe_t* handle, int mode) {
+  char name_buffer[1 + UV__PATH_MAX];
+  int desired_mode;
+  size_t name_len;
+  const char* name;
+  int fd;
+  int r;
+
+  if (handle == NULL)
+    return UV_EBADF;
+
+  fd = uv__stream_fd(handle);
+  if (fd == -1)
+    return UV_EBADF;
+
+  if (mode != UV_READABLE &&
+      mode != UV_WRITABLE &&
+      mode != (UV_WRITABLE | UV_READABLE))
+    return UV_EINVAL;
+
+  desired_mode = 0;
+  if (mode & UV_READABLE)
+    desired_mode |= S_IRUSR | S_IRGRP | S_IROTH;
+  if (mode & UV_WRITABLE)
+    desired_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
+
+  /* fchmod on macOS and (Free|Net|Open)BSD does not support UNIX sockets. */
+  if (fchmod(fd, desired_mode))
+    if (errno != EINVAL && errno != EOPNOTSUPP)
+      return UV__ERR(errno);
+
+  /* Fall back to chmod. */
+  name_len = sizeof(name_buffer);
+  r = uv_pipe_getsockname(handle, name_buffer, &name_len);
+  if (r != 0)
+    return r;
+  name = name_buffer;
+
+  /* On some platforms, getsockname returns an empty string, and we try with pipe_fname. */
+  if (name_len == 0 && handle->pipe_fname != NULL)
+    name = handle->pipe_fname;
+
+  if (chmod(name, desired_mode))
+    return UV__ERR(errno);
+
+  return 0;
+}
+
+
+int uv_pipe(uv_os_fd_t fds[2], int read_flags, int write_flags) {
+  uv_os_fd_t temp[2];
+  int err;
+#if defined(__linux__) || \
+    defined(__FreeBSD__) || \
+    defined(__OpenBSD__) || \
+    defined(__DragonFly__) || \
+    defined(__NetBSD__) || \
+    defined(__illumos__) || \
+    (defined(UV__SOLARIS_11_4) && UV__SOLARIS_11_4)
+  int flags = O_CLOEXEC;
+
+  if ((read_flags & UV_NONBLOCK_PIPE) && (write_flags & UV_NONBLOCK_PIPE))
+    flags |= UV_FS_O_NONBLOCK;
+
+  if (pipe2(temp, flags))
+    return UV__ERR(errno);
+
+  if (flags & UV_FS_O_NONBLOCK) {
+    fds[0] = temp[0];
+    fds[1] = temp[1];
+    return 0;
+  }
+#else
+  if (pipe(temp))
+    return UV__ERR(errno);
+
+  if ((err = uv__cloexec(temp[0], 1)))
+    goto fail;
+
+  if ((err = uv__cloexec(temp[1], 1)))
+    goto fail;
+#endif
+
+  if (read_flags & UV_NONBLOCK_PIPE)
+    if ((err = uv__nonblock(temp[0], 1)))
+      goto fail;
+
+  if (write_flags & UV_NONBLOCK_PIPE)
+    if ((err = uv__nonblock(temp[1], 1)))
+      goto fail;
+
+  fds[0] = temp[0];
+  fds[1] = temp[1];
+  return 0;
+
+fail:
+  uv__close(temp[0]);
+  uv__close(temp[1]);
+  return err;
+}
+
+
+int uv__make_pipe(int fds[2], int flags) {
+  return uv_pipe(fds,
+                 flags & UV_NONBLOCK_PIPE,
+                 flags & UV_NONBLOCK_PIPE);
+}