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use std::mem;
use libc::{c_char};
use std::ffi::CStr;
use std::str::from_utf8_unchecked;
mod ffi {
use libc::c_int;
use super::UtsName;
extern {
pub fn uname(buf: *mut UtsName) -> c_int;
}
}
const UTSNAME_LEN: usize = 65;
#[repr(C)]
#[derive(Copy)]
pub struct UtsName {
sysname: [c_char; UTSNAME_LEN],
nodename: [c_char; UTSNAME_LEN],
release: [c_char; UTSNAME_LEN],
version: [c_char; UTSNAME_LEN],
machine: [c_char; UTSNAME_LEN],
// ifdef _GNU_SOURCE
#[allow(dead_code)]
domainname: [c_char; UTSNAME_LEN]
}
// workaround for `derive(Clone)` not working for fixed-length arrays
impl Clone for UtsName { fn clone(&self) -> UtsName { *self } }
impl UtsName {
pub fn sysname<'a>(&'a self) -> &'a str {
to_str(&(&self.sysname as *const c_char ) as *const *const c_char)
}
pub fn nodename<'a>(&'a self) -> &'a str {
to_str(&(&self.nodename as *const c_char ) as *const *const c_char)
}
pub fn release<'a>(&'a self) -> &'a str {
to_str(&(&self.release as *const c_char ) as *const *const c_char)
}
pub fn version<'a>(&'a self) -> &'a str {
to_str(&(&self.version as *const c_char ) as *const *const c_char)
}
pub fn machine<'a>(&'a self) -> &'a str {
to_str(&(&self.machine as *const c_char ) as *const *const c_char)
}
}
pub fn uname() -> UtsName {
unsafe {
let mut ret: UtsName = mem::uninitialized();
ffi::uname(&mut ret as *mut UtsName);
ret
}
}
#[inline]
fn to_str<'a>(s: *const *const c_char) -> &'a str {
unsafe {
let res = CStr::from_ptr(*s).to_bytes();
from_utf8_unchecked(res)
}
}
#[cfg(test)]
mod test {
use super::uname;
#[test]
pub fn test_uname() {
assert_eq!(uname().sysname(), "Linux");
}
}
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