gander_core/linux/
mod.rs

1//! Linux `/proc` and `/sys` access.
2//!
3//! Split into two layers:
4//!  * `parse` — pure functions over `&[u8]`, unit-testable against fixtures
5//!  * `scan`  — the IO layer, using thread-local scratch buffers
6//!
7//! Both are configured by a `root` path so tests can point at a fixture tree
8//! instead of the live `/proc`.
9
10pub mod delayacct;
11pub mod fsops;
12pub mod parse;
13pub mod scan;
14pub mod system;
15
16pub struct LinuxPlatform;
17
18impl LinuxPlatform {
19    /// Clock ticks per second (`_SC_CLK_TCK`). Never hardcode 100.
20    pub fn clk_tck() -> u64 {
21        // SAFETY: sysconf is thread-safe and has no preconditions.
22        let v = unsafe { libc::sysconf(libc::_SC_CLK_TCK) };
23        if v > 0 {
24            v as u64
25        } else {
26            100
27        }
28    }
29
30    /// Memory page size (`_SC_PAGESIZE`).
31    pub fn page_size() -> u64 {
32        // SAFETY: as above.
33        let v = unsafe { libc::sysconf(libc::_SC_PAGESIZE) };
34        if v > 0 {
35            v as u64
36        } else {
37            4096
38        }
39    }
40}
41
42/// Number of online CPUs, used to normalize CPU%.
43pub fn cpu_count() -> usize {
44    // SAFETY: `sysconf(_SC_NPROCESSORS_ONLN)` has no preconditions.
45    let v = unsafe { libc::sysconf(libc::_SC_NPROCESSORS_ONLN) };
46    if v > 0 {
47        v as usize
48    } else {
49        1
50    }
51}
gander_core/linux/mod.rs

gander_core/linux/
mod.rs
