# 1.0.0[−][src]Struct std::process::ChildStderr

    pub struct ChildStderr { /* fields omitted */ }

A handle to a child process's stderr.

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

When an instance of `ChildStderr` is dropped, the `ChildStderr`'s underlying file handle will be closed.

## Trait Implementations

### `impl AsRawFd for ChildStderr` 1.2.0[src]

#### `fn as_raw_fd(&self) -> RawFd`[src]

This is supported on Unix only.

Extracts the raw file descriptor. Read more

### `impl AsRawHandle for ChildStderr` 1.2.0[src]

#### `fn as_raw_handle(&self) -> RawHandle`[src]

This is supported on Windows only.

Extracts the raw handle, without taking any ownership.

### `impl Debug for ChildStderr` 1.16.0[src]

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

Formats the value using the given formatter. Read more

### `impl From<ChildStderr> for Stdio` 1.20.0[src]

#### `fn from(child: ChildStderr) -> Stdio`[src]

Converts a `ChildStderr` into a `Stdio`

# Examples

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

    let reverse = Command::new("rev")
        .arg("non_existing_file.txt")
        .stderr(Stdio::piped())
        .spawn()
        .expect("failed reverse command");

    let cat = Command::new("cat")
        .arg("-")
        .stdin(reverse.stderr.unwrap()) // Converted into a Stdio here
        .output()
        .expect("failed echo command");

    assert_eq!(
        String::from_utf8_lossy(&cat.stdout),
        "rev: cannot open non_existing_file.txt: No such file or directory\n"
    );

Run

### `impl IntoRawFd for ChildStderr` 1.4.0[src]

#### `fn into_raw_fd(self) -> RawFd`[src]

This is supported on Unix only.

Consumes this object, returning the raw underlying file descriptor. Read more

### `impl IntoRawHandle for ChildStderr` 1.4.0[src]

#### `fn into_raw_handle(self) -> RawHandle`[src]

This is supported on Windows only.

Consumes this object, returning the raw underlying handle. Read more

### `impl Read for ChildStderr`[src]

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

Pull some bytes from this source into the specified buffer, returning how many bytes were read. Read more

#### `fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize>`[src]

Like `read`, except that it reads into a slice of buffers. Read more

#### `fn is_read_vectored(&self) -> bool`[src]

🔬 This is a nightly-only experimental API. (`can_vector` #69941)

Determines if this `Read`er has an efficient `read_vectored` implementation. Read more

#### `unsafe fn initializer(&self) -> Initializer`[src]

🔬 This is a nightly-only experimental API. (`read_initializer` #42788)

Determines if this `Read`er can work with buffers of uninitialized memory. Read more

#### `fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize>`[src]

Read all bytes until EOF in this source, placing them into `buf`. Read more

#### `fn read_to_string(&mut self, buf: &mut String) -> Result<usize>`[src]

Read all bytes until EOF in this source, appending them to `buf`. Read more

#### `fn read_exact(&mut self, buf: &mut [u8]) -> Result<()>`1.6.0[src]

Read the exact number of bytes required to fill `buf`. Read more

#### `fn by_ref(&mut self) -> &mut Selfⓘ

### Notable traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
where
Self: Sized,` [src]

Creates a "by reference" adaptor for this instance of `Read`. Read more

#### `fn bytes(self) -> Bytes<Self>ⓘ

### Notable traits for Bytes<R>

`impl<R: Read> Iterator for Bytes<R> type Item = Result<u8>;`
where
Self: Sized,` [src]

Transforms this `Read` instance to an `Iterator` over its bytes. Read more

#### `fn chain<R: Read>(self, next: R) -> Chain<Self, R>ⓘ

### Notable traits for Chain<T, U>

`impl<T: Read, U: Read> Read for Chain<T, U>`
where
Self: Sized,` [src]

Creates an adaptor which will chain this stream with another. Read more

#### `fn take(self, limit: u64) -> Take<Self>ⓘ

### Notable traits for Take<T>

`impl<T: Read> Read for Take<T>`
where
Self: Sized,` [src]

Creates an adaptor which will read at most `limit` bytes from it. Read more

## Auto Trait Implementations

### `impl RefUnwindSafe for ChildStderr`

### `impl Send for ChildStderr`

### `impl Sync for ChildStderr`

### `impl Unpin for ChildStderr`

### `impl UnwindSafe for ChildStderr`

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `fn borrow(&self) -> &Tⓘ

### Notable traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`[src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

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

### Notable traits for &'_ mut F

`impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`[src]

Mutably borrows from an owned value. Read more

### `impl<T> From<T> for T`[src]

#### `fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `fn into(self) -> U`[src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

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

The type returned in the event of a conversion error.

#### `fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.