fs-id 0.2.0

Uniquely identify files within the system
Documentation 
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use std::{io, mem, os::fd::AsRawFd};
use wasi::{wasi_snapshot_preview1::fd_filestat_get, Filestat};
use crate::{GetID, FileID};

pub type FileIDImpl = (u64, u64);

impl<T: AsRawFd> GetID for T {
	fn get_id(&self) -> io::Result<FileID> {
		let fd = self.as_raw_fd();
		unsafe {
			let mut filestat: Filestat = mem::zeroed();
			if fd_filestat_get(fd, &mut filestat as *mut _ as i32) == 0 {
				Ok(FileID((filestat.dev, filestat.ino)))
			} else {
				Err(io::Error::last_os_error())
			}
		}
	}
}