Struct JodChild

#[repr(transparent)]
pub struct JodChild(pub Child);

A std::process::Child wrapper that will kill the child on drop.

Tuple Fields

0: Child

Implementations

impl JodChild

pub fn spawn(command: Command) -> Result<Self>

pub fn into_inner(self) -> Child

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

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

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

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

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 Debug for JodChild

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Deref for JodChild

type Target = Child

The resulting type after dereferencing.

fn deref(&self) -> &Child

Dereferences the value.

impl DerefMut for JodChild

fn deref_mut(&mut self) -> &mut Child

Mutably dereferences the value.

impl Drop for JodChild

fn drop(&mut self)

Executes the destructor for this type.