vfork-rs

vfork-rs is used in embedded low memory to run an external program and read the stdout output.

Just like the name, the vfork-rs uses the linux vfork syscall. the vfork syscall is used to create new processes without copying the page tables of the parent process.

Notice

Used in linux only.

Usage

use vfork::Command;

fn main() {
    let s = "hello, world!";
    let mut cmd = Command::new("/bin/echo")
        .arg(s)
        .spawn()
        .expect("failed to execute process");

    let status_code = cmd.wait().expect("failed to wait process");
    assert_eq!(0, status_code.code());

    let output = cmd.output().expect("failed to get output");
    assert_eq!(String::from_utf8_lossy(&output), s);
}

Reference

https://man7.org/linux/man-pages/man2/vfork.2.html