This crate wraps socketpair with AF_UNIX platforms, and emulates this
interface using CreateNamedPipe on Windows.

It has a "stream" interface, which corresponds to SOCK_STREAM and
PIPE_TYPE_BYTE, and a "seqpacket" interface, which corresponds to
SOCK_SEQPACKET and PIPE_TYPE_MESSAGE.

Example

let (mut a, mut b) = socketpair_stream()?;

writeln!(a, "hello world")?;

let mut buf = [0_u8; 4096];
let n = b.read(&mut buf)?;
assert_eq!(str::from_utf8(&buf[..n]).unwrap(), "hello world\n");

Support for async-std and tokio is temporarily disabled until those crates
contain the needed implementations of the I/O safety traits.