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: stdout.rs
    path of file: ./repos/remote-pty/remote-pty-slave/src
    
    the code of the file until where you have to start completion: use std::{
    fs::File,
    io::Read,
    os::unix::prelude::FromRawFd,
    ptr,
    sync::mpsc::channel,
    thread::{self, JoinHandle},
    time::Duration,
};

use remote_pty_common::{
    channel::{Channel, RemoteChannel},
    log::debug,
    proto::{
        slave::{PtySlaveCall, PtySlaveCallType, PtySlaveResponse, WriteStdoutCall},
        Fd,
    },
};

use crate::{
    conf::{get_conf, Conf, State},
    fd::{get_inode_from_fd, get_open_fds_by_inode},
    init::is_proc_forked,
    signal::block_signals_on_thread,
};

#[cfg(target_os = "linux")]
#[link(name = "c")]
extern "C" {
    #[link_name = "stdout"]
    static mut LIBC_STDOUT: *mut libc::FILE;
    #[link_name = "stderr"]
    static mut LIBC_STDERR: *mut libc::FILE;
}

#[cfg(target_os = "linux")]
static mut STDOUT_STREAM_THREAD: Option<(JoinHandle<()>, libc::c_int)> = Option::None;

// this replaces the stdout fd's with a fd which is streamed to the remote master
pub(crate) fn init_stdout(conf: &Conf, mut chan: RemoteChannel, pre_fork_state: Option<&State>) {
    debug("redirecting stdout");

    let stdout_fds = pre_fork_state
        .and_then(|s| s.stdout_inode)
        .and_then(|inode| get_open_fds_by_inode(inode).ok())
        .unwrap_or_else(|| conf.stdout_fds.clone());

   
    
extern "C" fn wait_for_output() {
    debug("atexit: stdout");

    let conf = match get_conf() {
        Ok(conf) => conf,
        Err(err) => {
            debug(format!("failed to get conf: {}", err));
            return;
        }
    };

    if !conf.is_main_thread() {
        return;
    }

    let (thread, read_fd) = match unsafe { STDOUT_STREAM_THREAD.take() } {
        Some(t) => t,
        None => {
            debug("failed to get stdout thread");
            return;
        }
    };

    unsafe {
        // flush any remaining buffers
        libc::fflush(ptr::null_mut());
    }

    if let Ok(state) = conf.state.lock() {
        debug(format!("closing fds pointing to inode {:?}", state.stdout_inode));

        if let Some(fds) = state
            .stdout_inode
            .and_then(|i| get_open_fds_by_inode(i).ok())
            .map(|fds| fds.into_iter().filter(|fd| *fd != read_fd).collect::<Vec<_>>())
        {
            for fd in &fds {
                unsafe {
                    libc::close(*fd);
                }
            }

            debug(format!("closed {:?} fds pointing to stdout", fds));
        }
    }

    // it's very possible there are still open fd's to the write end
    // of the stdout pipe at this point.
    // if this is the case, the stdout thread join will run indefinitely.
    // we construct a channel so we can signal when it completes
    // but only give it a grace period of 3 seconds to do so.
    // why 3 seconds? good question
    let (sender, receiver) = channel();
    thread::spawn(move || {
        let _ = block_signals_on_thread();
        let _ = thread.join();
        let _ = sender.send(1);
    });
    let res = receiver.recv_timeout(Duration::from_secs(3));

    if let Err(err) = res {
        debug(format!("could not join stdout: {:?}", err));
    }
}