use std::io::ErrorKind;
use crate::scanner_rust::{generic_array::typenum::U768, ScannerAscii, ScannerError};
#[derive(Default, Debug, Clone)]
pub struct Mem {
pub total: usize,
pub used: usize,
pub free: usize,
pub shared: usize,
pub buffers: usize,
pub cache: usize,
pub available: usize,
}
#[derive(Default, Debug, Clone)]
pub struct Swap {
pub total: usize,
pub used: usize,
pub free: usize,
pub cache: usize,
}
#[derive(Default, Debug, Clone)]
pub struct Free {
pub mem: Mem,
pub swap: Swap,
}
pub fn free() -> Result<Free, ScannerError> {
const USEFUL_ITEMS: [&[u8]; 11] = [
b"MemTotal",
b"MemFree",
b"MemAvailable",
b"Buffers",
b"Cached",
b"SwapCached",
b"SwapTotal",
b"SwapFree",
b"Shmem",
b"Slab",
b"SUnreclaim",
];
let mut sc: ScannerAscii<_, U768> = ScannerAscii::scan_path2("/proc/meminfo")?;
let mut item_values = [0usize; USEFUL_ITEMS.len()];
for (i, &item) in USEFUL_ITEMS.iter().enumerate() {
loop {
let label = sc.next_raw()?.ok_or(ErrorKind::UnexpectedEof)?;
if label.starts_with(item) {
let value = sc.next_usize()?.ok_or(ErrorKind::UnexpectedEof)?;
item_values[i] = value * 1024;
sc.drop_next()?.ok_or(ErrorKind::UnexpectedEof)?;
break;
} else {
sc.drop_next_line()?.ok_or(ErrorKind::UnexpectedEof)?;
}
}
}
let total = item_values[0];
let free = item_values[1];
let available = item_values[2];
let buffers = item_values[3];
let cached = item_values[4];
let swap_cached = item_values[5];
let swap_total = item_values[6];
let swap_free = item_values[7];
let shmem = item_values[8];
let slab = item_values[9];
let s_unreclaim = item_values[10];
let total_cached = cached + slab - s_unreclaim;
let mem = Mem {
total,
used: total - free - buffers - total_cached,
free,
shared: shmem,
buffers,
cache: total_cached,
available,
};
let swap = Swap {
total: swap_total,
used: swap_total - swap_free - swap_cached,
free: swap_free,
cache: swap_cached,
};
Ok(Free {
mem,
swap,
})
}