# Struct std::process::ChildStdin

1.0.0 · source ·

    pub struct ChildStdin { /* private fields */ }

Expand description

A handle to a child process’s standard input (stdin).

This struct is used in the `stdin` field on `Child`.

When an instance of `ChildStdin` is dropped, the `ChildStdin`’s underlying file handle will be closed. If the child process was blocked on input prior to being dropped, it will become unblocked after dropping.

## Trait Implementations§

1.63.0 · source§

### impl AsFd for ChildStdin

Available on Unix only.
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#### fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor. Read more
1.63.0 · source§

### impl AsHandle for ChildStdin

Available on Windows only.
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#### fn as_handle(&self) -> BorrowedHandle<'_>

Borrows the handle. Read more
1.2.0 · source§

### impl AsRawFd for ChildStdin

Available on Unix only.
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#### fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor. Read more
1.2.0 · source§

### impl AsRawHandle for ChildStdin

Available on Windows only.
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#### fn as_raw_handle(&self) -> RawHandle

Extracts the raw handle. Read more
1.16.0 · source§

### impl Debug for ChildStdin

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
1.63.0 · source§

### impl From<ChildStdin> for OwnedFd

Available on Unix only.
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#### fn from(child_stdin: ChildStdin) -> OwnedFd

Converts to this type from the input type.
1.63.0 · source§

### impl From<ChildStdin> for OwnedHandle

Available on Windows only.
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#### fn from(child_stdin: ChildStdin) -> OwnedHandle

Converts to this type from the input type.
1.20.0 · source§

### impl From<ChildStdin> for Stdio

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#### fn from(child: ChildStdin) -> Stdio

Converts a `ChildStdin` into a `Stdio`.

##### Examples

`ChildStdin` will be converted to `Stdio` using `Stdio::from` under the hood.

    use std::process::{Command, Stdio};

    let reverse = Command::new("rev")
        .stdin(Stdio::piped())
        .spawn()
        .expect("failed reverse command");

    let _echo = Command::new("echo")
        .arg("Hello, world!")
        .stdout(reverse.stdin.unwrap()) // Converted into a Stdio here
        .output()
        .expect("failed echo command");

    // "!dlrow ,olleH" echoed to console

Run
1.74.0 · source§

### impl From<OwnedFd> for ChildStdin

Available on Unix only.

Create a `ChildStdin` from the provided `OwnedFd`.

The provided file descriptor must point to a pipe with the `CLOEXEC` flag set.

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#### fn from(fd: OwnedFd) -> ChildStdin ⓘ

Converts to this type from the input type.
1.74.0 · source§

### impl From<OwnedHandle> for ChildStdin

Available on Windows only.

Create a `ChildStdin` from the provided `OwnedHandle`.

The provided handle must be asynchronous, as reading and writing from and to it is implemented using asynchronous APIs.

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#### fn from(handle: OwnedHandle) -> ChildStdin ⓘ

Converts to this type from the input type.
1.4.0 · source§

### impl IntoRawFd for ChildStdin

Available on Unix only.
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#### fn into_raw_fd(self) -> RawFd

Consumes this object, returning the raw underlying file descriptor. Read more
1.4.0 · source§

### impl IntoRawHandle for ChildStdin

Available on Windows only.
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#### fn into_raw_handle(self) -> RawHandle

Consumes this object, returning the raw underlying handle. Read more
1.48.0 · source§

### impl Write for &ChildStdin

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#### fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this writer, returning how many bytes were written. Read more
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#### fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize>

Like `write`, except that it writes from a slice of buffers. Read more
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#### fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (`can_vector` #69941)
Determines if this `Write`r has an efficient `write_vectored` implementation. Read more
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#### fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
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#### fn write_all(&mut self, buf: &[u8]) -> Result<()>

Attempts to write an entire buffer into this writer. Read more
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#### fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<()>

🔬This is a nightly-only experimental API. (`write_all_vectored` #70436)
Attempts to write multiple buffers into this writer. Read more
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#### fn write_fmt(&mut self, fmt: Arguments<'_>) -> Result<()>

Writes a formatted string into this writer, returning any error encountered. Read more
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#### fn by_ref(&mut self) -> &mut Self where Self: Sized,

Creates a “by reference” adapter for this instance of `Write`. Read more
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### impl Write for ChildStdin

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#### fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this writer, returning how many bytes were written. Read more
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#### fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize>

Like `write`, except that it writes from a slice of buffers. Read more
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#### fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (`can_vector` #69941)
Determines if this `Write`r has an efficient `write_vectored` implementation. Read more
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#### fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
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#### fn write_all(&mut self, buf: &[u8]) -> Result<()>

Attempts to write an entire buffer into this writer. Read more
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#### fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<()>

🔬This is a nightly-only experimental API. (`write_all_vectored` #70436)
Attempts to write multiple buffers into this writer. Read more
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#### fn write_fmt(&mut self, fmt: Arguments<'_>) -> Result<()>

Writes a formatted string into this writer, returning any error encountered. Read more
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#### fn by_ref(&mut self) -> &mut Self where Self: Sized,

Creates a “by reference” adapter for this instance of `Write`. Read more

## Auto Trait Implementations§

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### impl RefUnwindSafe for ChildStdin

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### impl Send for ChildStdin

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### impl Sync for ChildStdin

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### impl Unpin for ChildStdin

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### impl UnwindSafe for ChildStdin

## Blanket Implementations§

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### impl<T> Any for Twhere T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for Twhere T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for Twhere T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for Twhere U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.