You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sysctl_bindings.rs
    path of file: ./repos/bottom/src/data_collection/processes/macos
    
    the code of the file until where you have to start completion: //! Partial bindings from Apple's open source code for getting process information.
//! Some of this is based on [heim's binding implementation](https://github.com/heim-rs/heim/blob/master/heim-process/src/sys/macos/bindings/process.rs).

use std::mem;

use anyhow::{bail, Result};
use libc::{
    boolean_t, c_char, c_long, c_short, c_uchar, c_ushort, c_void, dev_t, gid_t, itimerval, pi
    
pub(crate) fn kinfo_process(pid: Pid) -> Result<kinfo_proc> {
    let mut name: [i32; 4] = [CTL_KERN, KERN_PROC, KERN_PROC_PID, pid];
    let mut size = mem::size_of::<kinfo_proc>();
    let mut info = mem::MaybeUninit::<kinfo_proc>::uninit();

    // SAFETY: libc binding, we assume all arguments are valid.
    let result = unsafe {
        libc::sysctl(
            name.as_mut_ptr(),
            4,
            info.as_mut_ptr() as *mut libc::c_void,
            &mut size,
            std::ptr::null_mut(),
            0,
        )
    };

    if result < 0 {
        bail!("failed to get process for pid {pid}");
    }

    // sysctl succeeds but size is zero, happens when process has gone away
    if size == 0 {
        bail!("failed to get process for pid {pid}");
    }

    // SAFETY: info is initialized if result succeeded and returned a non-negative result. If sysctl failed, it returns
    // -1 with errno set.
    //
    // Source: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/sysctl.3.html
    unsafe { Ok(info.assume_init()) }
}