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24 lines
946 B
Rust
24 lines
946 B
Rust
use anyhow::bail;
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use libc::{uname, utsname};
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use regex::Regex;
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use std::{cell::OnceCell, ffi::CStr, mem};
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pub fn kernel_version() -> anyhow::Result<(u8, u8, u8)> {
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static mut RE: OnceCell<Regex> = OnceCell::new();
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let re =
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unsafe { &mut RE }.get_or_init(|| Regex::new(r"^([0-9]+)\.([0-9]+)\.([0-9]+)").unwrap());
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let mut data: utsname = unsafe { mem::zeroed() };
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let ret = unsafe { uname(&mut data) };
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assert!(ret >= 0, "libc::uname failed.");
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let release_cstr = unsafe { CStr::from_ptr(data.release.as_ptr()) };
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let release = release_cstr.to_string_lossy();
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if let Some(caps) = re.captures(&release) {
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let major = caps.get(1).unwrap().as_str().parse().unwrap();
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let minor = caps.get(2).unwrap().as_str().parse().unwrap();
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let patch = caps.get(3).unwrap().as_str().parse().unwrap();
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Ok((major, minor, patch))
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} else {
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bail!("no kernel version found");
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}
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}
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