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: mod.rs
    path of file: ./repos/wasmer/lib/wasix/src/syscalls
    
    the code of the file until where you have to start completion: #![allow(unused, clippy::too_many_arguments, clippy::cognitive_complexity)]

pub mod types {
    pub use wasmer_wasix_types::{types::*, wasi};
}

#[cfg(any(
    target_os = "freebsd",
    target_os = "linux",
    target_os = "android",
    target_vendor = "apple"
))]
pub mod unix;
#[cfg(target_family = "wasm")]
pub mod wasm;
#[cfg(target_os = "windows")]
pub mod windows;

pub mod journal;
pub mod wasi;
pub mod wasix;

use bytes::{Buf, BufM
    
        fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
            if let Poll::Ready(res) = Pin::new(&mut self.pinned_work).poll(cx) {
                return Poll::Ready(Ok(res));
            }
            if let Some(exit_code) = self.env.should_exit() {
                return Poll::Ready(Err(WasiError::Exit(exit_code)));
            }
            if self.env.thread.has_signals_or_subscribe(cx.waker()) {
                return Poll::Ready(Ok(Err(Errno::Intr)));
            }
            Poll::Pending
        }