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use __internal::Sealed;
use std::io::Result;
#[cfg(unix)]
use std::os::unix::io::{AsRawFd, RawFd};
#[cfg(windows)]
use std::os::windows::io::{AsRawSocket, RawSocket};
#[cfg(unix)]
type Raw = RawFd;
#[cfg(windows)]
type Raw = RawSocket;
#[cfg(not(any(unix, windows)))]
type Raw = std::convert::Infallible;
pub trait AsRaw: Sealed {
fn as_raw(&self) -> Raw;
}
#[cfg(unix)]
impl<T: AsRawFd + ?Sized> AsRaw for T {
fn as_raw(&self) -> Raw {
self.as_raw_fd()
}
}
#[cfg(windows)]
impl<T: AsRawSocket + ?Sized> AsRaw for T {
fn as_raw(&self) -> Raw {
self.as_raw_socket()
}
}
#[cfg(unix)]
mod unix_impl {
use std::{
io::Result,
mem::MaybeUninit,
os::{raw::c_int, unix::io::RawFd},
};
#[inline]
pub fn fionread_impl(sock: RawFd) -> Result<usize> {
use nix::libc::FIONREAD;
nix::ioctl_read_bad!(fionread, FIONREAD, c_int);
let mut len = MaybeUninit::uninit();
unsafe { fionread(sock, len.as_mut_ptr()) }?;
Ok(unsafe { len.assume_init() } as usize)
}
}
#[cfg(windows)]
mod windows_impl {
use std::{
io::{self, Result},
mem::MaybeUninit,
os::windows::io::RawSocket,
};
use windows_sys::Win32::Networking::WinSock::{ioctlsocket, FIONREAD, SOCKET};
#[inline]
pub fn fionread_impl(sock: RawSocket) -> Result<usize> {
let mut len = MaybeUninit::uninit();
let res = unsafe { ioctlsocket(sock as SOCKET, FIONREAD, len.as_mut_ptr()) };
if res == 0 {
Ok(unsafe { len.assume_init() } as usize)
} else {
Err(io::Error::last_os_error())
}
}
}
#[cfg(not(any(windows, unix)))]
mod placeholder_impl {
use std::{convert::Infallible, io};
#[inline]
pub fn fionread_impl(_sock: Infallible) -> Result<usize> {
Err(io::Error::new(io::ErrorKind::Other, "not implemented"))
}
}
#[cfg(not(any(windows, unix)))]
use placeholder_impl::fionread_impl;
#[cfg(unix)]
use unix_impl::fionread_impl;
#[cfg(windows)]
use windows_impl::fionread_impl;
#[inline]
pub fn fionread<T: AsRaw + ?Sized>(sock: &T) -> Result<usize> {
fionread_impl(sock.as_raw())
}
#[doc(hidden)]
mod __internal {
#[cfg(unix)]
use std::os::unix::io::AsRawFd;
#[cfg(windows)]
use std::os::windows::io::AsRawSocket;
#[doc(hidden)]
pub trait Sealed {
#[doc(hidden)]
fn __sealed_trait_marker__() {}
}
#[cfg(unix)]
impl<T: AsRawFd + ?Sized> Sealed for T {}
#[cfg(windows)]
impl<T: AsRawSocket + ?Sized> Sealed for T {}
}
#[cfg(test)]
mod tests {
use super::*;
use std::{
io::Write,
net::{TcpListener, TcpStream},
sync::mpsc,
thread,
};
#[test]
fn test_fionread() {
let port = 41234u16;
let listener = TcpListener::bind(("::1", port)).unwrap();
let (tx1, rx1) = mpsc::channel();
let (tx2, rx2) = mpsc::channel();
let _ = thread::spawn(move || {
let (mut sock, _) = listener.accept().unwrap();
rx1.recv().unwrap();
sock.write_all(b"hello").unwrap();
tx2.send(()).unwrap();
});
let sock = TcpStream::connect(("::1", port)).unwrap();
assert_eq!(fionread(&sock).unwrap(), 0);
tx1.send(()).unwrap();
rx2.recv().unwrap();
assert_eq!(fionread(&sock).unwrap(), 5);
}
}