Struct std::process::ChildStderr

1.0.0 · source ·
pub struct ChildStderr {
    inner: AnonPipe,
}
Expand description

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.

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§inner: AnonPipe

Trait Implementations§

1.63.0 · source§

impl AsFd for ChildStderr

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 ChildStderr

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 ChildStderr

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 ChildStderr

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 ChildStderr

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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<ChildStderr> for OwnedFd

Available on Unix only.
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fn from(child_stderr: ChildStderr) -> OwnedFd

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

impl From<ChildStderr> for OwnedHandle

Available on Windows only.
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fn from(child_stderr: ChildStderr) -> OwnedHandle

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

impl From<ChildStderr> for Stdio

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fn from(child: ChildStderr) -> Stdio

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
1.4.0 · source§

impl IntoRawFd for ChildStderr

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 ChildStderr

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

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

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

Pull some bytes from this source into the specified buffer, returning how many bytes were read. Read more
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fn read_buf(&mut self, buf: BorrowedCursor<'_>) -> Result<()>

🔬This is a nightly-only experimental API. (read_buf #78485)
Pull some bytes from this source into the specified buffer. Read more
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fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize>

Like read, except that it reads into a slice of buffers. Read more
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fn is_read_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector #69941)
Determines if this Reader has an efficient read_vectored implementation. Read more
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fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize>

Read all bytes until EOF in this source, placing them into buf. Read more
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fn read_to_string(&mut self, buf: &mut String) -> Result<usize>

Read all bytes until EOF in this source, appending them to buf. Read more
1.6.0 · source§

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

Read the exact number of bytes required to fill buf. Read more
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fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<()>

🔬This is a nightly-only experimental API. (read_buf #78485)
Read the exact number of bytes required to fill cursor. Read more
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fn by_ref(&mut self) -> &mut Selfwhere Self: Sized,

Creates a “by reference” adaptor for this instance of Read. Read more
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fn bytes(self) -> Bytes<Self> where Self: Sized,

Transforms this Read instance to an Iterator over its bytes. Read more
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fn chain<R: Read>(self, next: R) -> Chain<Self, R> where Self: Sized,

Creates an adapter which will chain this stream with another. Read more
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fn take(self, limit: u64) -> Take<Self> where Self: Sized,

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

Auto Trait Implementations§

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.