// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license. use deno_core::op2; use deno_core::unsync::spawn_blocking; use deno_core::unsync::TaskQueue; use deno_core::AsyncMutFuture; use deno_core::AsyncRefCell; use deno_core::AsyncResult; use deno_core::BufMutView; use deno_core::BufView; use deno_core::CancelHandle; use deno_core::CancelTryFuture; use deno_core::OpState; use deno_core::RcRef; use deno_core::Resource; use deno_core::ResourceHandle; use deno_core::ResourceHandleFd; use fs::FileResource; use fs::FsError; use fs::FsResult; use fs::FsStat; use fs3::FileExt; use once_cell::sync::Lazy; use std::borrow::Cow; use std::cell::RefCell; use std::fs::File as StdFile; use std::future::Future; use std::io; use std::io::ErrorKind; use std::io::Read; use std::io::Seek; use std::io::Write; use std::rc::Rc; use tokio::io::AsyncRead; use tokio::io::AsyncReadExt; use tokio::io::AsyncWrite; use tokio::io::AsyncWriteExt; use tokio::process; #[cfg(unix)] use std::os::unix::io::FromRawFd; #[cfg(windows)] use std::os::windows::io::FromRawHandle; #[cfg(windows)] use winapi::um::processenv::GetStdHandle; #[cfg(windows)] use winapi::um::winbase; use deno_core::futures::TryFutureExt; #[cfg(windows)] use parking_lot::Condvar; #[cfg(windows)] use parking_lot::Mutex; #[cfg(windows)] use std::sync::Arc; pub mod fs; mod pipe; #[cfg(windows)] mod winpipe; mod bi_pipe; pub use pipe::pipe; pub use pipe::AsyncPipeRead; pub use pipe::AsyncPipeWrite; pub use pipe::PipeRead; pub use pipe::PipeWrite; pub use pipe::RawPipeHandle; pub use bi_pipe::bi_pipe_pair_raw; pub use bi_pipe::BiPipe; pub use bi_pipe::BiPipeRead; pub use bi_pipe::BiPipeResource; pub use bi_pipe::BiPipeWrite; pub use bi_pipe::RawBiPipeHandle; /// Abstraction over `AsRawFd` (unix) and `AsRawHandle` (windows) pub trait AsRawIoHandle { fn as_raw_io_handle(&self) -> RawIoHandle; } #[cfg(unix)] impl AsRawIoHandle for T where T: std::os::unix::io::AsRawFd, { fn as_raw_io_handle(&self) -> RawIoHandle { self.as_raw_fd() } } #[cfg(windows)] impl AsRawIoHandle for T where T: std::os::windows::io::AsRawHandle, { fn as_raw_io_handle(&self) -> RawIoHandle { self.as_raw_handle() } } /// Abstraction over `IntoRawFd` (unix) and `IntoRawHandle` (windows) pub trait IntoRawIoHandle { fn into_raw_io_handle(self) -> RawIoHandle; } #[cfg(unix)] impl IntoRawIoHandle for T where T: std::os::unix::io::IntoRawFd, { fn into_raw_io_handle(self) -> RawIoHandle { self.into_raw_fd() } } #[cfg(windows)] impl IntoRawIoHandle for T where T: std::os::windows::io::IntoRawHandle, { fn into_raw_io_handle(self) -> RawIoHandle { self.into_raw_handle() } } /// Abstraction over `FromRawFd` (unix) and `FromRawHandle` (windows) pub trait FromRawIoHandle: Sized { /// Constructs a type from a raw io handle (fd/HANDLE). /// /// # Safety /// /// Refer to the standard library docs ([unix](https://doc.rust-lang.org/stable/std/os/windows/io/trait.FromRawHandle.html#tymethod.from_raw_handle)) ([windows](https://doc.rust-lang.org/stable/std/os/fd/trait.FromRawFd.html#tymethod.from_raw_fd)) /// unsafe fn from_raw_io_handle(handle: RawIoHandle) -> Self; } #[cfg(unix)] impl FromRawIoHandle for T where T: std::os::unix::io::FromRawFd, { unsafe fn from_raw_io_handle(fd: RawIoHandle) -> T { // SAFETY: upheld by caller unsafe { T::from_raw_fd(fd) } } } #[cfg(windows)] impl FromRawIoHandle for T where T: std::os::windows::io::FromRawHandle, { unsafe fn from_raw_io_handle(fd: RawIoHandle) -> T { // SAFETY: upheld by caller unsafe { T::from_raw_handle(fd) } } } #[cfg(unix)] pub type RawIoHandle = std::os::fd::RawFd; #[cfg(windows)] pub type RawIoHandle = std::os::windows::io::RawHandle; pub fn close_raw_handle(handle: RawIoHandle) { #[cfg(unix)] { // SAFETY: libc call unsafe { libc::close(handle); } } #[cfg(windows)] { // SAFETY: win32 call unsafe { windows_sys::Win32::Foundation::CloseHandle(handle as _); } } } // Store the stdio fd/handles in global statics in order to keep them // alive for the duration of the application since the last handle/fd // being dropped will close the corresponding pipe. #[cfg(unix)] pub static STDIN_HANDLE: Lazy = Lazy::new(|| { // SAFETY: corresponds to OS stdin unsafe { StdFile::from_raw_fd(0) } }); #[cfg(unix)] pub static STDOUT_HANDLE: Lazy = Lazy::new(|| { // SAFETY: corresponds to OS stdout unsafe { StdFile::from_raw_fd(1) } }); #[cfg(unix)] pub static STDERR_HANDLE: Lazy = Lazy::new(|| { // SAFETY: corresponds to OS stderr unsafe { StdFile::from_raw_fd(2) } }); #[cfg(windows)] pub static STDIN_HANDLE: Lazy = Lazy::new(|| { // SAFETY: corresponds to OS stdin unsafe { StdFile::from_raw_handle(GetStdHandle(winbase::STD_INPUT_HANDLE)) } }); #[cfg(windows)] pub static STDOUT_HANDLE: Lazy = Lazy::new(|| { // SAFETY: corresponds to OS stdout unsafe { StdFile::from_raw_handle(GetStdHandle(winbase::STD_OUTPUT_HANDLE)) } }); #[cfg(windows)] pub static STDERR_HANDLE: Lazy = Lazy::new(|| { // SAFETY: corresponds to OS stderr unsafe { StdFile::from_raw_handle(GetStdHandle(winbase::STD_ERROR_HANDLE)) } }); deno_core::extension!(deno_io, deps = [ deno_web ], esm = [ "12_io.js" ], options = { stdio: Option, }, middleware = |op| match op.name { "op_print" => op_print(), _ => op, }, state = |state, options| { if let Some(stdio) = options.stdio { #[cfg(windows)] let stdin_state = { let st = Arc::new(Mutex::new(WinTtyState::default())); state.put(st.clone()); st }; #[cfg(unix)] let stdin_state = (); let t = &mut state.resource_table; let rid = t.add(fs::FileResource::new( Rc::new(match stdio.stdin.pipe { StdioPipeInner::Inherit => StdFileResourceInner::new( StdFileResourceKind::Stdin(stdin_state), STDIN_HANDLE.try_clone().unwrap(), ), StdioPipeInner::File(pipe) => StdFileResourceInner::file(pipe), }), "stdin".to_string(), )); assert_eq!(rid, 0, "stdin must have ResourceId 0"); let rid = t.add(FileResource::new( Rc::new(match stdio.stdout.pipe { StdioPipeInner::Inherit => StdFileResourceInner::new( StdFileResourceKind::Stdout, STDOUT_HANDLE.try_clone().unwrap(), ), StdioPipeInner::File(pipe) => StdFileResourceInner::file(pipe), }), "stdout".to_string(), )); assert_eq!(rid, 1, "stdout must have ResourceId 1"); let rid = t.add(FileResource::new( Rc::new(match stdio.stderr.pipe { StdioPipeInner::Inherit => StdFileResourceInner::new( StdFileResourceKind::Stderr, STDERR_HANDLE.try_clone().unwrap(), ), StdioPipeInner::File(pipe) => StdFileResourceInner::file(pipe), }), "stderr".to_string(), )); assert_eq!(rid, 2, "stderr must have ResourceId 2"); } }, ); #[derive(Default)] pub struct StdioPipe { pipe: StdioPipeInner, } impl StdioPipe { pub const fn inherit() -> Self { StdioPipe { pipe: StdioPipeInner::Inherit, } } pub fn file(f: impl Into) -> Self { StdioPipe { pipe: StdioPipeInner::File(f.into()), } } } #[derive(Default)] enum StdioPipeInner { #[default] Inherit, File(StdFile), } impl Clone for StdioPipe { fn clone(&self) -> Self { match &self.pipe { StdioPipeInner::Inherit => Self { pipe: StdioPipeInner::Inherit, }, StdioPipeInner::File(pipe) => Self { pipe: StdioPipeInner::File(pipe.try_clone().unwrap()), }, } } } /// Specify how stdin, stdout, and stderr are piped. /// By default, inherits from the process. #[derive(Clone, Default)] pub struct Stdio { pub stdin: StdioPipe, pub stdout: StdioPipe, pub stderr: StdioPipe, } #[derive(Debug)] pub struct WriteOnlyResource { stream: AsyncRefCell, } impl From for WriteOnlyResource { fn from(stream: S) -> Self { Self { stream: stream.into(), } } } impl WriteOnlyResource where S: AsyncWrite + Unpin + 'static, { pub fn borrow_mut(self: &Rc) -> AsyncMutFuture { RcRef::map(self, |r| &r.stream).borrow_mut() } async fn write(self: Rc, data: &[u8]) -> Result { let mut stream = self.borrow_mut().await; let nwritten = stream.write(data).await?; Ok(nwritten) } async fn shutdown(self: Rc) -> Result<(), io::Error> { let mut stream = self.borrow_mut().await; stream.shutdown().await?; Ok(()) } pub fn into_inner(self) -> S { self.stream.into_inner() } } #[derive(Debug)] pub struct ReadOnlyResource { stream: AsyncRefCell, cancel_handle: CancelHandle, } impl From for ReadOnlyResource { fn from(stream: S) -> Self { Self { stream: stream.into(), cancel_handle: Default::default(), } } } impl ReadOnlyResource where S: AsyncRead + Unpin + 'static, { pub fn borrow_mut(self: &Rc) -> AsyncMutFuture { RcRef::map(self, |r| &r.stream).borrow_mut() } pub fn cancel_handle(self: &Rc) -> RcRef { RcRef::map(self, |r| &r.cancel_handle) } pub fn cancel_read_ops(&self) { self.cancel_handle.cancel() } async fn read(self: Rc, data: &mut [u8]) -> Result { let mut rd = self.borrow_mut().await; let nread = rd.read(data).try_or_cancel(self.cancel_handle()).await?; Ok(nread) } pub fn into_inner(self) -> S { self.stream.into_inner() } } pub type ChildStdinResource = WriteOnlyResource; impl Resource for ChildStdinResource { fn name(&self) -> Cow { "childStdin".into() } deno_core::impl_writable!(); fn shutdown(self: Rc) -> AsyncResult<()> { Box::pin(self.shutdown().map_err(|e| e.into())) } } pub type ChildStdoutResource = ReadOnlyResource; impl Resource for ChildStdoutResource { deno_core::impl_readable_byob!(); fn name(&self) -> Cow { "childStdout".into() } fn close(self: Rc) { self.cancel_read_ops(); } } pub type ChildStderrResource = ReadOnlyResource; impl Resource for ChildStderrResource { deno_core::impl_readable_byob!(); fn name(&self) -> Cow { "childStderr".into() } fn close(self: Rc) { self.cancel_read_ops(); } } #[cfg(windows)] #[derive(Default)] pub struct WinTtyState { pub cancelled: bool, pub reading: bool, pub screen_buffer_info: Option, pub cvar: Arc, } #[derive(Clone)] enum StdFileResourceKind { File, // For stdout and stderr, we sometimes instead use std::io::stdout() directly, // because we get some Windows specific functionality for free by using Rust // std's wrappers. So we take a bit of a complexity hit in order to not // have to duplicate the functionality in Rust's std/src/sys/windows/stdio.rs #[cfg(windows)] Stdin(Arc>), #[cfg(not(windows))] Stdin(()), Stdout, Stderr, } pub struct StdFileResourceInner { kind: StdFileResourceKind, // We can't use an AsyncRefCell here because we need to allow // access to the resource synchronously at any time and // asynchronously one at a time in order cell: RefCell>, // Used to keep async actions in order and only allow one // to occur at a time cell_async_task_queue: Rc, handle: ResourceHandleFd, } impl StdFileResourceInner { pub fn file(fs_file: StdFile) -> Self { StdFileResourceInner::new(StdFileResourceKind::File, fs_file) } fn new(kind: StdFileResourceKind, fs_file: StdFile) -> Self { // We know this will be an fd let handle = ResourceHandle::from_fd_like(&fs_file).as_fd_like().unwrap(); StdFileResourceInner { kind, handle, cell: RefCell::new(Some(fs_file)), cell_async_task_queue: Default::default(), } } fn with_sync(&self, action: F) -> FsResult where F: FnOnce(&mut StdFile) -> FsResult, { match self.cell.try_borrow_mut() { Ok(mut cell) if cell.is_some() => action(cell.as_mut().unwrap()), _ => Err(fs::FsError::FileBusy), } } fn with_inner_blocking_task( &self, action: F, ) -> impl Future + '_ where F: FnOnce(&mut StdFile) -> R + Send + 'static, { // we want to restrict this to one async action at a time let acquire_fut = self.cell_async_task_queue.acquire(); async move { let permit = acquire_fut.await; // we take the value out of the cell, use it on a blocking task, // then put it back into the cell when we're done let mut did_take = false; let mut cell_value = { let mut cell = self.cell.borrow_mut(); match cell.as_mut().unwrap().try_clone().ok() { Some(value) => value, None => { did_take = true; cell.take().unwrap() } } }; let (cell_value, result) = spawn_blocking(move || { let result = action(&mut cell_value); (cell_value, result) }) .await .unwrap(); if did_take { // put it back self.cell.borrow_mut().replace(cell_value); } drop(permit); // explicit for clarity result } } fn with_blocking_task( &self, action: F, ) -> impl Future where F: FnOnce() -> R + Send + 'static, { // we want to restrict this to one async action at a time let acquire_fut = self.cell_async_task_queue.acquire(); async move { let _permit = acquire_fut.await; spawn_blocking(action).await.unwrap() } } #[cfg(windows)] async fn handle_stdin_read( &self, state: Arc>, mut buf: BufMutView, ) -> FsResult<(usize, BufMutView)> { loop { let state = state.clone(); let fut = self.with_inner_blocking_task(move |file| { /* Start reading, and set the reading flag to true */ state.lock().reading = true; let nread = match file.read(&mut buf) { Ok(nread) => nread, Err(e) => return Err((e.into(), buf)), }; let mut state = state.lock(); state.reading = false; /* If we canceled the read by sending a VK_RETURN event, restore the screen state to undo the visual effect of the VK_RETURN event */ if state.cancelled { if let Some(screen_buffer_info) = state.screen_buffer_info { // SAFETY: WinAPI calls to open conout$ and restore visual state. unsafe { let handle = winapi::um::fileapi::CreateFileW( "conout$" .encode_utf16() .chain(Some(0)) .collect::>() .as_ptr(), winapi::um::winnt::GENERIC_READ | winapi::um::winnt::GENERIC_WRITE, winapi::um::winnt::FILE_SHARE_READ | winapi::um::winnt::FILE_SHARE_WRITE, std::ptr::null_mut(), winapi::um::fileapi::OPEN_EXISTING, 0, std::ptr::null_mut(), ); let mut pos = screen_buffer_info.dwCursorPosition; /* If the cursor was at the bottom line of the screen buffer, the VK_RETURN would have caused the buffer contents to scroll up by one line. The right position to reset the cursor to is therefore one line higher */ if pos.Y == screen_buffer_info.dwSize.Y - 1 { pos.Y -= 1; } winapi::um::wincon::SetConsoleCursorPosition(handle, pos); winapi::um::handleapi::CloseHandle(handle); } } /* Reset the cancelled flag */ state.cancelled = false; /* Unblock the main thread */ state.cvar.notify_one(); return Err((FsError::FileBusy, buf)); } Ok((nread, buf)) }); match fut.await { Err((FsError::FileBusy, b)) => { buf = b; continue; } other => return other.map_err(|(e, _)| e), } } } } #[async_trait::async_trait(?Send)] impl crate::fs::File for StdFileResourceInner { fn write_sync(self: Rc, buf: &[u8]) -> FsResult { // Rust will line buffer and we don't want that behavior // (see https://github.com/denoland/deno/issues/948), so flush stdout and stderr. // Although an alternative solution could be to bypass Rust's std by // using the raw fds/handles, it will cause encoding issues on Windows // that we get solved for free by using Rust's stdio wrappers (see // std/src/sys/windows/stdio.rs in Rust's source code). match self.kind { StdFileResourceKind::File => self.with_sync(|file| Ok(file.write(buf)?)), StdFileResourceKind::Stdin(_) => { Err(Into::::into(ErrorKind::Unsupported).into()) } StdFileResourceKind::Stdout => { // bypass the file and use std::io::stdout() let mut stdout = std::io::stdout().lock(); let nwritten = stdout.write(buf)?; stdout.flush()?; Ok(nwritten) } StdFileResourceKind::Stderr => { // bypass the file and use std::io::stderr() let mut stderr = std::io::stderr().lock(); let nwritten = stderr.write(buf)?; stderr.flush()?; Ok(nwritten) } } } fn read_sync(self: Rc, buf: &mut [u8]) -> FsResult { match self.kind { StdFileResourceKind::File | StdFileResourceKind::Stdin(_) => { self.with_sync(|file| Ok(file.read(buf)?)) } StdFileResourceKind::Stdout | StdFileResourceKind::Stderr => { Err(FsError::NotSupported) } } } fn write_all_sync(self: Rc, buf: &[u8]) -> FsResult<()> { match self.kind { StdFileResourceKind::File => { self.with_sync(|file| Ok(file.write_all(buf)?)) } StdFileResourceKind::Stdin(_) => { Err(Into::::into(ErrorKind::Unsupported).into()) } StdFileResourceKind::Stdout => { // bypass the file and use std::io::stdout() let mut stdout = std::io::stdout().lock(); stdout.write_all(buf)?; stdout.flush()?; Ok(()) } StdFileResourceKind::Stderr => { // bypass the file and use std::io::stderr() let mut stderr = std::io::stderr().lock(); stderr.write_all(buf)?; stderr.flush()?; Ok(()) } } } async fn write_all(self: Rc, buf: BufView) -> FsResult<()> { match self.kind { StdFileResourceKind::File => { self .with_inner_blocking_task(move |file| Ok(file.write_all(&buf)?)) .await } StdFileResourceKind::Stdin(_) => { Err(Into::::into(ErrorKind::Unsupported).into()) } StdFileResourceKind::Stdout => { self .with_blocking_task(move || { // bypass the file and use std::io::stdout() let mut stdout = std::io::stdout().lock(); stdout.write_all(&buf)?; stdout.flush()?; Ok(()) }) .await } StdFileResourceKind::Stderr => { self .with_blocking_task(move || { // bypass the file and use std::io::stderr() let mut stderr = std::io::stderr().lock(); stderr.write_all(&buf)?; stderr.flush()?; Ok(()) }) .await } } } async fn write( self: Rc, view: BufView, ) -> FsResult { match self.kind { StdFileResourceKind::File => { self .with_inner_blocking_task(|file| { let nwritten = file.write(&view)?; Ok(deno_core::WriteOutcome::Partial { nwritten, view }) }) .await } StdFileResourceKind::Stdin(_) => { Err(Into::::into(ErrorKind::Unsupported).into()) } StdFileResourceKind::Stdout => { self .with_blocking_task(|| { // bypass the file and use std::io::stdout() let mut stdout = std::io::stdout().lock(); let nwritten = stdout.write(&view)?; stdout.flush()?; Ok(deno_core::WriteOutcome::Partial { nwritten, view }) }) .await } StdFileResourceKind::Stderr => { self .with_blocking_task(|| { // bypass the file and use std::io::stderr() let mut stderr = std::io::stderr().lock(); let nwritten = stderr.write(&view)?; stderr.flush()?; Ok(deno_core::WriteOutcome::Partial { nwritten, view }) }) .await } } } fn read_all_sync(self: Rc) -> FsResult> { match self.kind { StdFileResourceKind::File | StdFileResourceKind::Stdin(_) => { let mut buf = Vec::new(); self.with_sync(|file| Ok(file.read_to_end(&mut buf)?))?; Ok(buf) } StdFileResourceKind::Stdout | StdFileResourceKind::Stderr => { Err(FsError::NotSupported) } } } async fn read_all_async(self: Rc) -> FsResult> { match self.kind { StdFileResourceKind::File | StdFileResourceKind::Stdin(_) => { self .with_inner_blocking_task(|file| { let mut buf = Vec::new(); file.read_to_end(&mut buf)?; Ok(buf) }) .await } StdFileResourceKind::Stdout | StdFileResourceKind::Stderr => { Err(FsError::NotSupported) } } } fn chmod_sync(self: Rc, _mode: u32) -> FsResult<()> { #[cfg(unix)] { use std::os::unix::prelude::PermissionsExt; self.with_sync(|file| { Ok(file.set_permissions(std::fs::Permissions::from_mode(_mode))?) }) } #[cfg(not(unix))] Err(FsError::NotSupported) } async fn chmod_async(self: Rc, _mode: u32) -> FsResult<()> { #[cfg(unix)] { use std::os::unix::prelude::PermissionsExt; self .with_inner_blocking_task(move |file| { Ok(file.set_permissions(std::fs::Permissions::from_mode(_mode))?) }) .await } #[cfg(not(unix))] Err(FsError::NotSupported) } fn seek_sync(self: Rc, pos: io::SeekFrom) -> FsResult { self.with_sync(|file| Ok(file.seek(pos)?)) } async fn seek_async(self: Rc, pos: io::SeekFrom) -> FsResult { self .with_inner_blocking_task(move |file| Ok(file.seek(pos)?)) .await } fn datasync_sync(self: Rc) -> FsResult<()> { self.with_sync(|file| Ok(file.sync_data()?)) } async fn datasync_async(self: Rc) -> FsResult<()> { self .with_inner_blocking_task(|file| Ok(file.sync_data()?)) .await } fn sync_sync(self: Rc) -> FsResult<()> { self.with_sync(|file| Ok(file.sync_all()?)) } async fn sync_async(self: Rc) -> FsResult<()> { self .with_inner_blocking_task(|file| Ok(file.sync_all()?)) .await } fn stat_sync(self: Rc) -> FsResult { self.with_sync(|file| Ok(file.metadata().map(FsStat::from_std)?)) } async fn stat_async(self: Rc) -> FsResult { self .with_inner_blocking_task(|file| { Ok(file.metadata().map(FsStat::from_std)?) }) .await } fn lock_sync(self: Rc, exclusive: bool) -> FsResult<()> { self.with_sync(|file| { if exclusive { file.lock_exclusive()?; } else { file.lock_shared()?; } Ok(()) }) } async fn lock_async(self: Rc, exclusive: bool) -> FsResult<()> { self .with_inner_blocking_task(move |file| { if exclusive { file.lock_exclusive()?; } else { file.lock_shared()?; } Ok(()) }) .await } fn unlock_sync(self: Rc) -> FsResult<()> { self.with_sync(|file| Ok(file.unlock()?)) } async fn unlock_async(self: Rc) -> FsResult<()> { self .with_inner_blocking_task(|file| Ok(file.unlock()?)) .await } fn truncate_sync(self: Rc, len: u64) -> FsResult<()> { self.with_sync(|file| Ok(file.set_len(len)?)) } async fn truncate_async(self: Rc, len: u64) -> FsResult<()> { self .with_inner_blocking_task(move |file| Ok(file.set_len(len)?)) .await } fn utime_sync( self: Rc, atime_secs: i64, atime_nanos: u32, mtime_secs: i64, mtime_nanos: u32, ) -> FsResult<()> { let atime = filetime::FileTime::from_unix_time(atime_secs, atime_nanos); let mtime = filetime::FileTime::from_unix_time(mtime_secs, mtime_nanos); self.with_sync(|file| { filetime::set_file_handle_times(file, Some(atime), Some(mtime))?; Ok(()) }) } async fn utime_async( self: Rc, atime_secs: i64, atime_nanos: u32, mtime_secs: i64, mtime_nanos: u32, ) -> FsResult<()> { let atime = filetime::FileTime::from_unix_time(atime_secs, atime_nanos); let mtime = filetime::FileTime::from_unix_time(mtime_secs, mtime_nanos); self .with_inner_blocking_task(move |file| { filetime::set_file_handle_times(file, Some(atime), Some(mtime))?; Ok(()) }) .await } async fn read_byob( self: Rc, mut buf: BufMutView, ) -> FsResult<(usize, BufMutView)> { match &self.kind { /* On Windows, we need to handle special read cancellation logic for stdin */ #[cfg(windows)] StdFileResourceKind::Stdin(state) => { self.handle_stdin_read(state.clone(), buf).await } _ => { self .with_inner_blocking_task(|file| { let nread = file.read(&mut buf)?; Ok((nread, buf)) }) .await } } } fn try_clone_inner(self: Rc) -> FsResult> { let inner: &Option<_> = &self.cell.borrow(); match inner { Some(inner) => Ok(Rc::new(StdFileResourceInner { kind: self.kind.clone(), cell: RefCell::new(Some(inner.try_clone()?)), cell_async_task_queue: Default::default(), handle: self.handle, })), None => Err(FsError::FileBusy), } } fn as_stdio(self: Rc) -> FsResult { match self.kind { StdFileResourceKind::File => self.with_sync(|file| { let file = file.try_clone()?; Ok(file.into()) }), _ => Ok(std::process::Stdio::inherit()), } } fn backing_fd(self: Rc) -> Option { Some(self.handle) } } // override op_print to use the stdout and stderr in the resource table #[op2(fast)] pub fn op_print( state: &mut OpState, #[string] msg: &str, is_err: bool, ) -> Result<(), deno_core::error::AnyError> { let rid = if is_err { 2 } else { 1 }; FileResource::with_file(state, rid, move |file| { Ok(file.write_all_sync(msg.as_bytes())?) }) }