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use std::mem;
use libc::{self, c_char};
use std::ffi::CStr;
use std::str::from_utf8_unchecked;
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
#[repr(transparent)]
pub struct UtsName(libc::utsname);
impl UtsName {
pub fn sysname(&self) -> &str {
to_str(&(&self.0.sysname as *const c_char ) as *const *const c_char)
}
pub fn nodename(&self) -> &str {
to_str(&(&self.0.nodename as *const c_char ) as *const *const c_char)
}
pub fn release(&self) -> &str {
to_str(&(&self.0.release as *const c_char ) as *const *const c_char)
}
pub fn version(&self) -> &str {
to_str(&(&self.0.version as *const c_char ) as *const *const c_char)
}
pub fn machine(&self) -> &str {
to_str(&(&self.0.machine as *const c_char ) as *const *const c_char)
}
}
pub fn uname() -> UtsName {
unsafe {
let mut ret = mem::MaybeUninit::uninit();
libc::uname(ret.as_mut_ptr());
UtsName(ret.assume_init())
}
}
#[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 {
#[cfg(target_os = "linux")]
#[test]
pub fn test_uname_linux() {
assert_eq!(super::uname().sysname(), "Linux");
}
#[cfg(any(target_os = "macos", target_os = "ios"))]
#[test]
pub fn test_uname_darwin() {
assert_eq!(super::uname().sysname(), "Darwin");
}
#[cfg(target_os = "freebsd")]
#[test]
pub fn test_uname_freebsd() {
assert_eq!(super::uname().sysname(), "FreeBSD");
}
}