process_alive 0.2.0

Cross platform library to verify if a process is alive
Documentation 
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use std::io::Error;

use libc::kill;

use crate::{Pid, State};

pub fn state(pid: Pid) -> State {
    let pid: i32 = match pid.0.try_into() {
        Ok(pid) => pid,
        Err(_) => return State::Unknown,
    };

    unsafe {
        if kill(pid, 0) == 0 {
            return State::Alive;
        }
    }

    let errno = Error::last_os_error().raw_os_error().unwrap();
    if errno == libc::ESRCH {
        State::Dead
    } else {
        State::Unknown
    }
}