Cannot connect to abstract unix domain socket

[ghost]

Hello,

I'm using stable Rust 1.27.0.

According to man 7 unix, about abstract socket:

an abstract socket address is distinguished (from a pathname socket) by the fact that sun_path[0] is a null byte ('\0'). The socket's address in this namespace is given by the additional bytes in sun_path that are covered by the specified length of the address structure. (Null bytes in the name have no special significance.) The name has no connection with filesystem pathnames. When the address of an abstract socket is returned, the returned addrlen is greater than sizeof(sa_family_t) (i.e., greater than 2), and the name of the socket is contained in the first (addrlen - sizeof(sa_family_t)) bytes of sun_path.

I failed to run this:

use std::os::unix::net::UnixListener;
use std::path::PathBuf;

fn main() {
    let sock_path = PathBuf::from("\0test");
    match UnixListener::bind(&sock_path) {
        Ok(_) => println!("Server running at {:?}", &sock_path),
        Err(err) => eprintln!("Failed to start server: {}", &err),
    };
}

The error message was paths may not contain interior null bytes. I searched and found the code here:

https://doc.rust-lang.org/src/std/sys/unix/ext/net.rs.html#61

I consider this a bug, but I'm really not sure. May I ask if you could help?

Thank you,

[csmoe]

cc #14194
abstract socket is not supported right now, if you really need that, try nix crate: https://docs.rs/nix/0.11.0/nix/sys/socket/struct.UnixAddr.html#method.as_abstract

[ghost]

@csmoe

Thank you. As I understand from that issue: abstract socket is not fully supported on all unix systems. However I think it would be great if the API simply returns any OS error. That won't break the UnixListener::bind() signature.

I'm not sure if I should close this issue. So I leave it open.

[Havvy]

This is a dupe of #42048