Function read_ppid

crates/openshell-supervisor-network/src/procfs.rs:175–183

(pid: u32)

/// Read the `PPid` (parent PID) from `/proc/<pid>/status`.
#[cfg(target_os = "linux")]
pub fn read_ppid(pid: u32) -> Option<u32> {
    let status = std::fs::read_to_string(format!("/proc/{pid}/status")).ok()?;
    for line in status.lines() {
        if let Some(rest) = line.strip_prefix("PPid:") {
            return rest.trim().parse().ok();
        }
    }
    None
}

/// Walk the process tree upward from `pid`, collecting the binary path of each ancestor.
///