Struct otter_api_tests::Stdio 1.0.0[−][src]
pub struct Stdio(_);
Expand description
Implementations
A new pipe should be arranged to connect the parent and child processes.
Examples
With stdout:
use std::process::{Command, Stdio}; let output = Command::new("echo") .arg("Hello, world!") .stdout(Stdio::piped()) .output() .expect("Failed to execute command"); assert_eq!(String::from_utf8_lossy(&output.stdout), "Hello, world!\n"); // Nothing echoed to console
With stdin:
use std::io::Write; use std::process::{Command, Stdio}; let mut child = Command::new("rev") .stdin(Stdio::piped()) .stdout(Stdio::piped()) .spawn() .expect("Failed to spawn child process"); let mut stdin = child.stdin.take().expect("Failed to open stdin"); std::thread::spawn(move || { stdin.write_all("Hello, world!".as_bytes()).expect("Failed to write to stdin"); }); let output = child.wait_with_output().expect("Failed to read stdout"); assert_eq!(String::from_utf8_lossy(&output.stdout), "!dlrow ,olleH");
Writing more than a pipe buffer’s worth of input to stdin without also reading stdout and stderr at the same time may cause a deadlock. This is an issue when running any program that doesn’t guarantee that it reads its entire stdin before writing more than a pipe buffer’s worth of output. The size of a pipe buffer varies on different targets.
The child inherits from the corresponding parent descriptor.
Examples
With stdout:
use std::process::{Command, Stdio}; let output = Command::new("echo") .arg("Hello, world!") .stdout(Stdio::inherit()) .output() .expect("Failed to execute command"); assert_eq!(String::from_utf8_lossy(&output.stdout), ""); // "Hello, world!" echoed to console
With stdin:
use std::process::{Command, Stdio}; use std::io::{self, Write}; let output = Command::new("rev") .stdin(Stdio::inherit()) .stdout(Stdio::piped()) .output() .expect("Failed to execute command"); print!("You piped in the reverse of: "); io::stdout().write_all(&output.stdout).unwrap();
This stream will be ignored. This is the equivalent of attaching the
stream to /dev/null
.
Examples
With stdout:
use std::process::{Command, Stdio}; let output = Command::new("echo") .arg("Hello, world!") .stdout(Stdio::null()) .output() .expect("Failed to execute command"); assert_eq!(String::from_utf8_lossy(&output.stdout), ""); // Nothing echoed to console
With stdin:
use std::process::{Command, Stdio}; let output = Command::new("rev") .stdin(Stdio::null()) .stdout(Stdio::piped()) .output() .expect("Failed to execute command"); assert_eq!(String::from_utf8_lossy(&output.stdout), ""); // Ignores any piped-in input
Trait Implementations
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" );
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
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");
Converts a File
into a Stdio
Examples
File
will be converted to Stdio
using Stdio::from
under the hood.
use std::fs::File; use std::process::Command; // With the `foo.txt` file containing `Hello, world!" let file = File::open("foo.txt").unwrap(); let reverse = Command::new("rev") .stdin(file) // Implicit File conversion into a Stdio .output() .expect("failed reverse command"); assert_eq!(reverse.stdout, b"!dlrow ,olleH");
Auto Trait Implementations
impl RefUnwindSafe for Stdio
impl UnwindSafe for Stdio
Blanket Implementations
Mutably borrows from an owned value. Read more
pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<R, Global>
impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<I, A> Iterator for Box<I, A> where
A: Allocator,
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
A: Allocator + 'static,
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;
pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<R, Global>
impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<I, A> Iterator for Box<I, A> where
A: Allocator,
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
A: Allocator + 'static,
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
impl<A> DynCastExt for A
impl<A> DynCastExt for A
pub fn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
T: ?Sized,
A: DynCastExtHelper<T>,
pub fn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
T: ?Sized,
A: DynCastExtHelper<T>,
Use this to cast from one trait object type to another. Read more
pub fn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
T: ?Sized,
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
pub fn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
T: ?Sized,
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
Use this to upcast a trait to one of its supertraits. Read more
pub fn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
T: ?Sized,
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
pub fn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
T: ?Sized,
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
pub fn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
pub fn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
Use this to cast from one trait object type to another. With this method the type parameter is a config type that uniquely specifies which cast should be preformed. Read more
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]pub fn vzip(self) -> V