std::process

Struct ChildStdout

1.0.0 · source
pub struct ChildStdout { /* private fields */ }
Expand description

A handle to a child process’s standard output (stdout).

This struct is used in the stdout field on Child.

When an instance of ChildStdout is dropped, the ChildStdout’s underlying file handle will be closed.

Trait Implementations§

1.63.0 · source§

impl AsFd for ChildStdout

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 ChildStdout

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 ChildStdout

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 ChildStdout

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 ChildStdout

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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<ChildStdout> for OwnedFd

Available on Unix only.
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fn from(child_stdout: ChildStdout) -> OwnedFd

Takes ownership of a ChildStdout’s file descriptor.

1.63.0 · source§

impl From<ChildStdout> for OwnedHandle

Available on Windows only.
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fn from(child_stdout: ChildStdout) -> OwnedHandle

Takes ownership of a ChildStdout’s file handle.

1.20.0 · source§

impl From<ChildStdout> for Stdio

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fn from(child: ChildStdout) -> Stdio

Converts a ChildStdout into a Stdio.

§Examples

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

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

let hello = Command::new("echo")
    .arg("Hello, world!")
    .stdout(Stdio::piped())
    .spawn()
    .expect("failed echo command");

let reverse = Command::new("rev")
    .stdin(hello.stdout.unwrap())  // Converted into a Stdio here
    .output()
    .expect("failed reverse command");

assert_eq!(reverse.stdout, b"!dlrow ,olleH\n");
1.74.0 · source§

impl From<OwnedFd> for ChildStdout

Available on Unix only.

Creates a ChildStdout 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) -> ChildStdout

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

impl From<OwnedHandle> for ChildStdout

Available on Windows only.

Creates a ChildStdout 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) -> ChildStdout

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

impl IntoRawFd for ChildStdout

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 ChildStdout

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

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

impl Read for ChildStdout

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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>

Reads all bytes until EOF in this source, placing them into buf. Read more
1.0.0 · source§

fn read_to_string(&mut self, buf: &mut String) -> Result<usize>

Reads 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<()>

Reads 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)
Reads the exact number of bytes required to fill cursor. Read more
1.0.0 · source§

fn by_ref(&mut self) -> &mut Self
where Self: Sized,

Creates a “by reference” adaptor for this instance of Read. Read more
1.0.0 · source§

fn bytes(self) -> Bytes<Self>
where Self: Sized,

Transforms this Read instance to an Iterator over its bytes. Read more
1.0.0 · source§

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
1.0.0 · source§

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 T
where 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 T
where 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 T
where 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 T
where 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 T
where 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 T
where 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.