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use std::fs;
use std::io::{self};
#[cfg(feature = "serde")]
use serde::{Serialize, Deserialize};
#[cfg(feature = "serde")]
#[derive(Debug, Default, Eq, PartialEq, Copy, Clone, Serialize, Deserialize)]
pub struct Memory {
total: u64,
free: u64,
available: u64,
buffers: u64,
cached: u64,
active: u64,
inactive: u64,
swap_total: u64,
swap_free: u64,
shared: u64,
}
#[cfg(not(feature = "serde"))]
#[derive(Debug, Default, Eq, PartialEq, Copy, Clone)]
pub struct Memory {
total: u64,
free: u64,
available: u64,
buffers: u64,
cached: u64,
active: u64,
inactive: u64,
swap_total: u64,
swap_free: u64,
shared: u64,
}
pub fn meminfo() -> io::Result<Memory> {
let mut memory = Memory::default();
let content = fs::read_to_string("/proc/meminfo")?;
for line in content.lines() {
let first_bytes = &line.as_bytes()[..2];
match first_bytes {
b"Me" | b"Ac" | b"In" | b"Bu" | b"Ca" | b"Sh" | b"Sw" => {},
_ => continue,
};
let mut parts = line.splitn(2, ':');
let field = match parts.next() {
Some("MemTotal") => &mut memory.total,
Some("MemFree") => &mut memory.free,
Some("MemAvailable") => &mut memory.available,
Some("Buffers") => &mut memory.buffers,
Some("Cached") => &mut memory.cached,
Some("Active") => &mut memory.active,
Some("Inactive") => &mut memory.inactive,
Some("SwapTotal") => &mut memory.swap_total,
Some("SwapFree") => &mut memory.swap_free,
Some("Shmem") => &mut memory.shared,
_ => continue,
};
match parts.next() {
Some(value) => *field = {
let bytes = match value.trim_start().splitn(2, ' ').next() {
Some(kbytes) => {
if let Ok(value) = kbytes.parse::<u64>() {
value * 1000
} else {
continue
}
}
None => continue
};
bytes
},
None => continue
}
}
Ok(memory)
}