oxedyne/fe2o3 — fe2o3_sys/src/uptime.rs

1.2 KiB, 1 run

created by r1870400018:10596, which is this file's identity for as long as the history lasts, whatever it is later renamed to

1	//! System uptime from `/proc/uptime`.
2
3	use crate::parse::{
4	parse_num,
5	read_to_string,
6	tokens,
7	};
8
9	use oxedyne_fe2o3_core::prelude::*;
10
11	/// Seconds since boot and seconds spent idle (summed across
12	/// every CPU). Both are floating-point as reported by the
13	/// kernel so sub-second precision is preserved.
14	#[derive(Clone, Copy, Debug, Default, PartialEq)]
15	pub struct Uptime {
16	/// Wall-clock seconds since boot.
17	pub seconds: f64,
18	/// Idle seconds, summed across every CPU.
19	pub idle_total: f64,
20	}
21
22	impl Uptime {
23	/// Read `/proc/uptime`.
24	pub fn sample() -> Outcome<Self> {
25	let content = res!(read_to_string("/proc/uptime"));
26	Self::from_line(content.trim())
27	}
28
29	/// Parse one `/proc/uptime` line of the form
30	/// `<uptime_seconds> <idle_seconds>`.
31	pub fn from_line(line: &str) -> Outcome<Self> {
32	let toks = tokens(line);
33	if toks.len() < 2 {
34	return Err(err!(
35	"uptime line has {} tokens: {:?}",
36	toks.len(), line;
37	Input, Size, Decode));
38	}
39	Ok(Self {
40	seconds: res!(parse_num::<f64>(toks[0], "uptime.seconds")),
41	idle_total: res!(parse_num::<f64>(toks[1], "uptime.idle_total")),
42	})
43	}
44	}