#process #pipe #async #tokio

pwner

Pwner is a Process Owner crate that allows ergonomic access to child processes

6 releases

0.1.5 Nov 15, 2020
0.1.4 Nov 6, 2020
0.1.3 Apr 7, 2020

#217 in Asynchronous

42 downloads per month
Used in rucline

MIT license

44KB
553 lines

pwner

Github MIT licensed Cargo Documentation

Pwner is a Process Owner crate that allows ergonomic access to child processes.

This module creates the possibility of owning a child and having convenient methods to read and write, while also killing the process gracefully upon dropping.

Spawning an owned process

use std::process::Command;
use pwner::Spawner;

Command::new("ls").spawn_owned().expect("ls command failed to start");

Reading and writing

use std::io::{BufRead, BufReader, Write};
use std::process::Command;
use pwner::Spawner;

let mut child = Command::new("cat").spawn_owned()?;
child.write_all(b"hello\n")?;

let mut output = String::new();
let mut reader = BufReader::new(child);
reader.read_line(&mut output)?;

assert_eq!("hello\n", output);

Stopping an owned process

The owned process is terminated whenever it is dropped.

Example

use std::process::Command;
use pwner::Spawner;

{
    let child = Command::new("ls").spawn_owned().expect("ls command failed to start");
}
// child is killed when dropped out of scope

Graceful dropping

Note: Only available on *nix platforms.

When the owned process gets dropped, Process will try to kill it gracefully by sending a SIGINT. If the process still doesn't die, a SIGTERM is sent and another chance is given, until finally a SIGKILL is sent.

Dependencies

~0–1MB
~18K SLoC