Function get_reaper_pids

src/process/procctl.rs:362–386

(process: ProcSelector)

#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub fn get_reaper_pids(process: ProcSelector) -> io::Result<Vec<PidInfo>> {
    // Sadly no better way to guarantee that we get all the results than to
    // allocate ≈8MB of memory…
    const PID_MAX: usize = 99999;
    let mut pids: Vec<procctl_reaper_pidinfo> = vec![Default::default(); PID_MAX];
    let mut pinfo = procctl_reaper_pids {
        rp_count: PID_MAX as _,
        rp_pad0: [0; 15],
        rp_pids: pids.as_mut_slice().as_mut_ptr(),
    };
    unsafe { procctl(PROC_REAP_GETPIDS, process, as_mut_ptr(&mut pinfo).cast())? };
    let mut result = Vec::new();
    for raw in pids.into_iter() {
        let flags = PidInfoFlags::from_bits_retain(raw.pi_flags);
        if !flags.contains(PidInfoFlags::VALID) {
            break;
        }
        result.push(PidInfo {
            flags,
            subtree: Pid::from_raw(raw.pi_subtree).ok_or(io::Errno::RANGE)?,
            pid: Pid::from_raw(raw.pi_pid).ok_or(io::Errno::RANGE)?,
        });
    }
    Ok(result)
}

const PROC_REAP_KILL: c_int = 6;