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//! Helpers for implementing [`StreamOps`].
use std::io;
#[cfg(target_os = "linux")]
use {
std::mem,
std::os::fd::{AsRawFd, RawFd},
};
#[cfg_attr(not(target_os = "linux"), allow(unused))]
use crate::StreamOps;
#[cfg(not(target_os = "linux"))]
use crate::UnsupportedStreamOp;
/// A wrapper over the file descriptor of a TCP socket.
///
/// Returned from various [`StreamOps::new_handle`] impls.
#[derive(Clone, Copy)]
#[cfg(target_os = "linux")]
pub(crate) struct TcpSockFd(RawFd);
#[cfg(target_os = "linux")]
impl AsRawFd for TcpSockFd {
fn as_raw_fd(&self) -> RawFd {
self.0
}
}
#[cfg(target_os = "linux")]
impl TcpSockFd {
/// Create a `TcpSockFd` out of a raw file descriptor.
pub(crate) fn from_fd(fd: &impl AsRawFd) -> Self {
Self(fd.as_raw_fd())
}
}
#[cfg(target_os = "linux")]
impl StreamOps for TcpSockFd {
fn set_tcp_notsent_lowat(&self, notsent_lowat: u32) -> io::Result<()> {
set_tcp_notsent_lowat(self, notsent_lowat)
}
fn new_handle(&self) -> Box<dyn StreamOps + Send + Unpin> {
Box::new(*self)
}
}
/// Helper for implementing [`set_tcp_notsent_lowat`](crate::StreamOps::set_tcp_notsent_lowat).
///
/// Only implemented on Linux. Returns an error on all other platforms.
#[cfg(target_os = "linux")]
pub(crate) fn set_tcp_notsent_lowat<S: AsRawFd>(sock: &S, notsent_lowat: u32) -> io::Result<()> {
let fd = sock.as_raw_fd();
let res = unsafe {
libc::setsockopt(
fd,
libc::SOL_TCP,
libc::TCP_NOTSENT_LOWAT,
¬sent_lowat as *const _ as *const libc::c_void,
mem::size_of_val(¬sent_lowat) as libc::socklen_t,
)
};
if res != 0 {
return Err(io::Error::last_os_error());
}
Ok(())
}
/// Helper for implementing [`set_tcp_notsent_lowat`](crate::StreamOps::set_tcp_notsent_lowat).
///
/// Only implemented on Linux. Returns an error on all other platforms.
#[cfg(not(target_os = "linux"))]
pub(crate) fn set_tcp_notsent_lowat<S>(_sock: &S, _notsent_lowat: u32) -> io::Result<()> {
Err(UnsupportedStreamOp::new(
"set_tcp_notsent_lowat",
"unsupported on non-linux platforms",
)
.into())
}
#[cfg(test)]
mod tests {
// @@ begin test lint list maintained by maint/add_warning @@
#![allow(clippy::bool_assert_comparison)]
#![allow(clippy::clone_on_copy)]
#![allow(clippy::dbg_macro)]
#![allow(clippy::mixed_attributes_style)]
#![allow(clippy::print_stderr)]
#![allow(clippy::print_stdout)]
#![allow(clippy::single_char_pattern)]
#![allow(clippy::unwrap_used)]
#![allow(clippy::unchecked_duration_subtraction)]
#![allow(clippy::useless_vec)]
#![allow(clippy::needless_pass_by_value)]
//! <!-- @@ end test lint list maintained by maint/add_warning @@ -->
use super::*;
use std::net::TcpListener;
#[cfg(target_os = "linux")]
pub(crate) fn get_tcp_notsent_lowat<S: AsRawFd>(sock: &S) -> io::Result<u32> {
let fd = sock.as_raw_fd();
let mut notsent_lowat = 0;
let mut socklen: u32 = mem::size_of_val(¬sent_lowat) as libc::socklen_t;
let res = unsafe {
libc::getsockopt(
fd,
libc::SOL_TCP,
libc::TCP_NOTSENT_LOWAT,
&mut notsent_lowat as *mut _ as *mut libc::c_void,
&mut socklen as *mut _,
)
};
if res != 0 {
return Err(io::Error::last_os_error());
}
Ok(notsent_lowat)
}
#[test]
#[cfg(target_os = "linux")]
#[cfg_attr(miri, ignore)] // sockets are unsupported https://github.com/rust-lang/miri/issues/3449
fn tcp_notsent_lowat() {
let sock = TcpListener::bind("127.0.0.1:0").unwrap();
set_tcp_notsent_lowat(&sock, 1337).unwrap();
let notsent_lowat = get_tcp_notsent_lowat(&sock).unwrap();
assert_eq!(1337, notsent_lowat);
}
#[test]
#[cfg(not(target_os = "linux"))]
#[cfg_attr(miri, ignore)] // sockets are unsupported https://github.com/rust-lang/miri/issues/3449
fn tcp_notsent_lowat() {
let sock = TcpListener::bind("127.0.0.1:0").unwrap();
// Currently not supported on non-linux platforms
assert!(set_tcp_notsent_lowat(&sock, 1337).is_err());
}
}
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