I/O Process

Set of I/O-free Rust coroutines and runtimes to manage processes.

This library allows you to manage processes using an I/O-agnostic approach, based on 3 concepts:

Coroutine

A coroutine is an I/O-free, resumable and composable state machine that emits I/O requests. A coroutine is considered terminated when it does not emit I/O requests anymore.

See available coroutines at ./src/coroutines.

Runtime

A runtime contains all the I/O logic, and is responsible for processing I/O requests emitted by coroutines.

See available runtimes at ./src/runtimes.

Loop

The loop is the glue between coroutines and runtimes. It makes the coroutine progress while allowing runtime to process I/O.

Examples

See complete examples at ./examples.

Spawn std blocking command

use io_process::{coroutines::SpawnThenWait, runtimes::std::handle, Command};

let mut command = Command::new("ls");
command.arg("-al");
command.arg("/tmp");

let mut arg = None;
let mut spawn = SpawnThenWait::new(command);

let status = loop {
    match spawn.resume(arg.take()) {
        Ok(status) => break status,
        Err(io) => arg = Some(handle(&mut spawn, io).unwrap()),
    }
}

Spawn tokio async command then wait for output

use io_process::{coroutines::SpawnThenWaitWithOutput, runtimes::tokio::handle, Command};

let mut command = Command::new("ls");
command.arg("-al");
command.arg("/tmp");

let mut arg = None;
let mut spawn = SpawnThenWaitWithOutput::new(command);

let output = loop {
    match spawn.resume(arg.take()) {
        Ok(output) => break output,
        Err(io) => arg = Some(handle(&mut spawn, io).await.unwrap()),
    }
}

More examples

Have a look at projects built on the top of this library:

• comodoro: CLI to manage timers

Sponsoring

Special thanks to the NLnet foundation and the European Commission that helped the project to receive financial support from various programs:

• NGI Assure in 2022
• NGI Zero Entrust in 2023
• NGI Zero Core in 2024 (still ongoing)

If you appreciate the project, feel free to donate using one of the following providers: