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use std::io::{Error, ErrorKind, Result};
use std::os::raw::{c_char, c_int};
macro_rules! error {
($e:expr) => {
Err(Error::new(ErrorKind::Other, $e))
};
}
#[repr(C)]
#[derive(Copy, Clone)]
struct utsname {
pub sysname: [c_char; 65usize],
pub nodename: [c_char; 65usize],
pub release: [c_char; 65usize],
pub version: [c_char; 65usize],
pub machine: [c_char; 65usize],
pub _domainname: [c_char; 65usize],
}
extern "C" {
fn uname(__name: *mut utsname) -> c_int;
}
pub struct Uname {
pub sysname: String,
pub nodename: String,
pub release: String,
pub version: String,
pub machine: String,
pub domainname: String,
}
impl Uname {
pub fn new() -> Result<Self> {
let mut raw: utsname = unsafe { std::mem::zeroed() };
if 0 != unsafe { uname(&mut raw) } {
error!("failed to put information about the system in uname")?;
}
let info: Uname = Uname {
sysname: fromraw(&raw.sysname)?,
nodename: fromraw(&raw.nodename)?,
release: fromraw(&raw.release)?,
version: fromraw(&raw.version)?,
machine: fromraw(&raw.machine)?,
domainname: fromraw(&raw._domainname)?,
};
Ok(info)
}
}
fn fromraw(s: &[c_char; 65usize]) -> Result<String> {
let mut v = s.iter().map(|x| *x as u8).collect::<Vec<u8>>();
v.retain(|x| *x != 0);
match String::from_utf8(v) {
Ok(res) => Ok(res),
Err(e) => error!(e.to_string())?,
}
}