pub(crate) fn set_tcp_notsent_lowat<S: AsRawFd>(sock: &S, notsent_lowat: u32) -> io::Result<()> {
#[cfg_attr(miri, ignore)] // sockets are unsupported https://github.com/rust-lang/miri/issues/3449
#[cfg_attr(miri, ignore)] // sockets are unsupported https://github.com/rust-lang/miri/issues/3449