1//! Get system identification
2use crate::{Errno, Result};
3use libc::c_char;
4use std::ffi::OsStr;
5use std::mem;
6use std::os::unix::ffi::OsStrExt;
7
8/// Describes the running system. Return type of [`uname`].
9#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
10#[repr(transparent)]
11pub struct UtsName(libc::utsname);
12
13impl UtsName {
14 /// Name of the operating system implementation.
15 pub fn sysname(&self) -> &OsStr {
16 cast_and_trim(&self.0.sysname)
17 }
18
19 /// Network name of this machine.
20 pub fn nodename(&self) -> &OsStr {
21 cast_and_trim(&self.0.nodename)
22 }
23
24 /// Release level of the operating system.
25 pub fn release(&self) -> &OsStr {
26 cast_and_trim(&self.0.release)
27 }
28
29 /// Version level of the operating system.
30 pub fn version(&self) -> &OsStr {
31 cast_and_trim(&self.0.version)
32 }
33
34 /// Machine hardware platform.
35 pub fn machine(&self) -> &OsStr {
36 cast_and_trim(&self.0.machine)
37 }
38
39 /// NIS or YP domain name of this machine.
40 #[cfg(linux_android)]
41 pub fn domainname(&self) -> &OsStr {
42 cast_and_trim(&self.0.domainname)
43 }
44}
45
46/// Get system identification
47pub fn uname() -> Result<UtsName> {
48 unsafe {
49 let mut ret: MaybeUninit = mem::MaybeUninit::zeroed();
50 Errno::result(libc::uname(buf:ret.as_mut_ptr()))?;
51 Ok(UtsName(ret.assume_init()))
52 }
53}
54
55fn cast_and_trim(slice: &[c_char]) -> &OsStr {
56 let length: usize = slice
57 .iter()
58 .position(|&byte| byte == 0)
59 .unwrap_or(default:slice.len());
60 let bytes: &[u8] =
61 unsafe { std::slice::from_raw_parts(data:slice.as_ptr().cast(), len:length) };
62
63 OsStr::from_bytes(slice:bytes)
64}
65