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: nix.rs
    path of file: ./repos/hostname/src
    
    the code of the file until where you have to start completion: use std::io;
#[cfg(feature = "set")]
use std::ffi::OsStr;
use std::ffi::OsString;
#[cfg(feature = "set")]
use std::os::unix::ffi::OsStrExt;
use std::os::unix::ffi::OsStringExt;

use libc;

const _POSIX_HOST_NAME_MAX: libc::c_long = 255;

pub fn get() -> io::Result<OsString> {
    // According to the POSIX specification,
    // host names are limited to `HOST_NAME_MAX
    
pub fn get() -> io::Result<OsString> {
    // According to the POSIX specification,
    // host names are limited to `HOST_NAME_MAX` bytes
    //
    // https://pubs.opengroup.org/onlinepubs/9699919799/functions/gethostname.html
    let limit = unsafe { libc::sysconf(libc::_SC_HOST_NAME_MAX) };
    let size = libc::c_long::max(limit, _POSIX_HOST_NAME_MAX) as usize;

    // Reserve additional space for terminating nul byte.
    let mut buffer = vec![0u8; size + 1];

    let result = unsafe {
        libc::gethostname(buffer.as_mut_ptr() as *mut libc::c_char, size)
    };

    if result != 0 {
        return Err(io::Error::last_os_error());
    }

    Ok(wrap_buffer(buffer))
}