malvin 0.2.4

Non-interactive research and coding agent
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use std::collections::HashSet;
use std::fs;
use std::io::ErrorKind;

pub(in crate::process_group_rss) fn linux_pids_sandbox_bytes(pids: &HashSet<u32>) -> Option<u64> {
    linux_pids_uss_bytes(pids).or_else(|| linux_pids_rss_bytes(pids))
}

pub(in crate::process_group_rss) fn linux_pids_uss_bytes(pids: &HashSet<u32>) -> Option<u64> {
    linux_pids_smaps_rollup_bytes(pids, parse_smaps_rollup_uss_bytes)
}

fn linux_pids_smaps_rollup_bytes(
    pids: &HashSet<u32>,
    parse_rollup: fn(&str) -> Option<u64>,
) -> Option<u64> {
    let mut total = 0u64;
    let mut saw = false;
    for pid in pids {
        let rollup_path = format!("/proc/{pid}/smaps_rollup");
        let rollup = match fs::read_to_string(&rollup_path) {
            Ok(s) => s,
            Err(e) if e.kind() == ErrorKind::NotFound => continue,
            Err(_) => continue,
        };
        let Some(bytes) = parse_rollup(&rollup) else {
            continue;
        };
        saw = true;
        total = total.saturating_add(bytes);
    }
    saw.then_some(total)
}

pub(in crate::process_group_rss) fn linux_pids_rss_bytes(pids: &HashSet<u32>) -> Option<u64> {
    let mut total = 0u64;
    let mut saw = false;
    for pid in pids {
        let status_path = format!("/proc/{pid}/status");
        let status = match fs::read_to_string(&status_path) {
            Ok(s) => s,
            Err(e) if e.kind() == ErrorKind::NotFound => continue,
            Err(_) => continue,
        };
        let Some(bytes) = parse_status_vm_rss_bytes(&status) else {
            continue;
        };
        saw = true;
        total = total.saturating_add(bytes);
    }
    saw.then_some(total)
}

pub(in crate::process_group_rss) fn parse_status_vm_rss_bytes(status: &str) -> Option<u64> {
    parse_proc_kib_field(status, "VmRSS:")
}

#[cfg(test)]
pub(in crate::process_group_rss) fn parse_smaps_rollup_pss_bytes(rollup: &str) -> Option<u64> {
    parse_proc_kib_field(rollup, "Pss:")
}

pub(in crate::process_group_rss) fn parse_smaps_rollup_uss_bytes(rollup: &str) -> Option<u64> {
    if let Some(uss) = parse_proc_kib_field(rollup, "USS:") {
        return Some(uss);
    }
    if let (Some(clean), Some(dirty)) = (
        parse_proc_kib_field(rollup, "Private_Clean:"),
        parse_proc_kib_field(rollup, "Private_Dirty:"),
    ) {
        return Some(clean.saturating_add(dirty));
    }
    let rss = parse_proc_kib_field(rollup, "Rss:")?;
    let shared_clean = parse_proc_kib_field(rollup, "Shared_Clean:").unwrap_or(0);
    let shared_dirty = parse_proc_kib_field(rollup, "Shared_Dirty:").unwrap_or(0);
    let shared = shared_clean.saturating_add(shared_dirty);
    Some(rss.saturating_sub(shared))
}

pub(in crate::process_group_rss) fn parse_proc_kib_field(text: &str, prefix: &str) -> Option<u64> {
    text.lines().find_map(|line| {
        let rest = line.strip_prefix(prefix)?;
        let kb_str = rest.trim().strip_suffix(" kB")?.trim();
        let kb: u64 = kb_str.parse().ok()?;
        kb.checked_mul(1024)
    })
}

#[cfg(test)]
#[allow(unused_imports)]
mod kiss_cov_gate_refs {
    use super::*;
    #[test]
    fn kiss_cov_unit_names() {
        let _ = linux_pids_uss_bytes;
        let _ = linux_pids_rss_bytes;
        let pids = std::iter::once(std::process::id()).collect::<std::collections::HashSet<_>>();
        let rss = linux_pids_rss_bytes(&pids).expect("rss");
        assert!(rss > 0);
    }
}