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: entry.rs
    path of file: ./repos/occlum/src/libos/src
    
    the code of the file until where you have to start completion: use std::ffi::{CStr, CString, OsString};
use std::path::{Path, PathBuf};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Once;

use super::*;
use crate::exception::*;
use crate::fs::HostStdioFds;
use crate::interrupt;
use crate::process::idle_reap_zombie_children;
use crate::process::{ProcessFilter, SpawnAttr};
use crate::signal::SigNum;
use crate::time::up_time::init;
use crate::util::host_file_util::{host_file_buffer, parse_host_file, write_host_file, HostFile};
use crate::util::log::LevelFilter;
use crate::util::mem_util::from_untrusted::*;
use
    
pub extern "C" fn occlum_ecall_exec_thread(libos_pid: i32, host_tid: i32) -> i32 {
    if HAS_INIT.load(Ordering::Acquire) == false {
        return ecall_errno!(EAGAIN);
    }

    panic::catch_unwind(|| {
        backtrace::__rust_begin_short_backtrace(|| {
            match do_exec_thread(libos_pid as pid_t, host_tid as pid_t) {
                Ok(exit_status) => exit_status,
                Err(e) => {
                    eprintln!("failed to execute a process: {}", e.backtrace());
                    ecall_errno!(e.errno())
                }
            }
        })
    })
    .unwrap_or(ecall_errno!(EFAULT))
}