mio 1.2.5

Lightweight non-blocking I/O.
Documentation 
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// Emscripten's node-backed AF_UNIX is stream-only (no datagram primitive).
#[cfg(not(target_os = "emscripten"))]
pub(crate) mod datagram {
    use std::io;
    use std::os::unix::net::{self, SocketAddr};

    pub(crate) fn bind_addr(_: &SocketAddr) -> io::Result<net::UnixDatagram> {
        os_required!()
    }

    pub(crate) fn unbound() -> io::Result<net::UnixDatagram> {
        os_required!()
    }

    pub(crate) fn pair() -> io::Result<(net::UnixDatagram, net::UnixDatagram)> {
        os_required!()
    }
}

pub(crate) mod listener {
    use std::io;
    use std::os::unix::net::{self, SocketAddr};

    use crate::net::UnixStream;

    pub(crate) fn bind_addr(_: &SocketAddr) -> io::Result<net::UnixListener> {
        os_required!()
    }

    pub(crate) fn accept(_: &net::UnixListener) -> io::Result<(UnixStream, SocketAddr)> {
        os_required!()
    }
}

pub(crate) mod stream {
    use std::io;
    use std::os::unix::net::{self, SocketAddr};

    pub(crate) fn connect_addr(_: &SocketAddr) -> io::Result<net::UnixStream> {
        os_required!()
    }

    // Emscripten has no `socketpair(2)` (no `uv_socketpair` exposed by node).
    #[cfg(not(target_os = "emscripten"))]
    pub(crate) fn pair() -> io::Result<(net::UnixStream, net::UnixStream)> {
        os_required!()
    }
}