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//! Get system identification
use crate::{Errno, Result};
use libc::c_char;
use std::ffi::OsStr;
use std::mem;
use std::os::unix::ffi::OsStrExt;
/// Describes the running system. Return type of [`uname`].
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
#[repr(transparent)]
pub struct UtsName(libc::utsname);
impl UtsName {
/// Name of the operating system implementation.
pub fn sysname(&self) -> &OsStr {
cast_and_trim(&self.0.sysname)
}
/// Network name of this machine.
pub fn nodename(&self) -> &OsStr {
cast_and_trim(&self.0.nodename)
}
/// Release level of the operating system.
pub fn release(&self) -> &OsStr {
cast_and_trim(&self.0.release)
}
/// Version level of the operating system.
pub fn version(&self) -> &OsStr {
cast_and_trim(&self.0.version)
}
/// Machine hardware platform.
pub fn machine(&self) -> &OsStr {
cast_and_trim(&self.0.machine)
}
/// NIS or YP domain name of this machine.
#[cfg(linux_android)]
pub fn domainname(&self) -> &OsStr {
cast_and_trim(&self.0.domainname)
}
}
/// Get system identification
pub fn uname() -> Result<UtsName> {
unsafe {
let mut ret = mem::MaybeUninit::zeroed();
Errno::result(libc::uname(ret.as_mut_ptr()))?;
Ok(UtsName(ret.assume_init()))
}
}
fn cast_and_trim(slice: &[c_char]) -> &OsStr {
let length = slice
.iter()
.position(|&byte| byte == 0)
.unwrap_or(slice.len());
let bytes =
unsafe { std::slice::from_raw_parts(slice.as_ptr().cast(), length) };
OsStr::from_bytes(bytes)
}
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