Struct substrate_cli_test_utils::KillChildOnDrop

pub struct KillChildOnDrop(pub Child);

Tuple Fields

0: Child

Implementations

impl KillChildOnDrop

pub fn stop(&mut self)

Stop the child and wait until it is finished.

Asserts if the exit status isn’t success.

pub fn stop_with_signal(&mut self, signal: Signal)

Same as Self::stop but takes the signal that is sent to stop the child.

pub fn assert_still_running(&mut self)

Asserts that the child is still running.

Methods from Deref<Target = Child>

pub fn kill(&mut self) -> Result<(), Error>

Forces the child process to exit. If the child has already exited, Ok(()) is returned.

The mapping to ErrorKinds is not part of the compatibility contract of the function.

This is equivalent to sending a SIGKILL on Unix platforms.

Examples

Basic usage:

use std::process::Command;

let mut command = Command::new("yes");
if let Ok(mut child) = command.spawn() {
    child.kill().expect("command couldn't be killed");
} else {
    println!("yes command didn't start");
}

pub fn id(&self) -> u32

Returns the OS-assigned process identifier associated with this child.

Examples

Basic usage:

use std::process::Command;

let mut command = Command::new("ls");
if let Ok(child) = command.spawn() {
    println!("Child's ID is {}", child.id());
} else {
    println!("ls command didn't start");
}

pub fn wait(&mut self) -> Result<ExitStatus, Error>

Waits for the child to exit completely, returning the status that it exited with. This function will continue to have the same return value after it has been called at least once.

The stdin handle to the child process, if any, will be closed before waiting. This helps avoid deadlock: it ensures that the child does not block waiting for input from the parent, while the parent waits for the child to exit.

Examples

Basic usage:

use std::process::Command;

let mut command = Command::new("ls");
if let Ok(mut child) = command.spawn() {
    child.wait().expect("command wasn't running");
    println!("Child has finished its execution!");
} else {
    println!("ls command didn't start");
}

pub fn try_wait(&mut self) -> Result<Option<ExitStatus>, Error>

Attempts to collect the exit status of the child if it has already exited.

This function will not block the calling thread and will only check to see if the child process has exited or not. If the child has exited then on Unix the process ID is reaped. This function is guaranteed to repeatedly return a successful exit status so long as the child has already exited.

If the child has exited, then Ok(Some(status)) is returned. If the exit status is not available at this time then Ok(None) is returned. If an error occurs, then that error is returned.

Note that unlike wait, this function will not attempt to drop stdin.

Examples

Basic usage:

use std::process::Command;

let mut child = Command::new("ls").spawn().unwrap();

match child.try_wait() {
    Ok(Some(status)) => println!("exited with: {status}"),
    Ok(None) => {
        println!("status not ready yet, let's really wait");
        let res = child.wait();
        println!("result: {res:?}");
    }
    Err(e) => println!("error attempting to wait: {e}"),
}

Trait Implementations

impl Deref for KillChildOnDrop

type Target = Child

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl DerefMut for KillChildOnDrop

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl Drop for KillChildOnDrop

fn drop(&mut self)

Executes the destructor for this type.