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/* Based on code from sysinfo: https://crates.io/crates/sysinfo
* Original licenses: MIT
* Original author: Guillaume Gomez
* License file: https://github.com/GuillaumeGomez/sysinfo/blob/master/LICENSE
*/
use libc::c_int;
fn get_system_info(value: c_int) -> Option<String> {
let mut mib: [c_int; 2] = [libc::CTL_KERN, value];
let mut size = 0;
// Call first to get size
unsafe {
libc::sysctl(
mib.as_mut_ptr(),
2,
std::ptr::null_mut(),
&mut size,
std::ptr::null_mut(),
0,
)
};
// exit early if we did not update the size
if size == 0 {
return None;
}
// set the buffer to the correct size
let mut buf = vec![0_u8; size as usize];
if unsafe {
libc::sysctl(
mib.as_mut_ptr(),
2,
buf.as_mut_ptr() as _,
&mut size,
std::ptr::null_mut(),
0,
)
} == -1
{
// If command fails return default
None
} else {
if let Some(pos) = buf.iter().position(|x| *x == 0) {
// Shrink buffer to terminate the null bytes
buf.resize(pos, 0);
}
String::from_utf8(buf).ok()
}
}
/// Get the version of the currently running kernel.
///
/// Returns `None` if an error occured.
pub fn kernel_version() -> Option<String> {
get_system_info(libc::KERN_OSRELEASE)
}
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