summaryrefslogtreecommitdiff
path: root/src/sys/utsname.rs
blob: 7eeb323b2ae365a55a3d72f1a6171352bf8e493c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
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");
    }
}