Panic when calling recv_from() after shutdown()

[zinid]

Environment

• Operating System: Ubuntu 20.04
• Rust Version: 1.78.0 (9b00956e5 2024-04-29)
• tokio-uring Version: 0.5.0

Description

A panic occurs when calling recv_from() on a UdpSocket after the socket has been shut down using shutdown(). The error message indicates that an Option::unwrap() is called on a None value within the recv_from method of the tokio-uring library.

Steps to Reproduce

1. Compile and run the following Rust code using Tokio-Uring:

   use std::net::{Shutdown, SocketAddr};
   use tokio_uring::net::UdpSocket;
   
   fn main() -> Result<(), std::io::Error> {
       tokio_uring::start(async {
           let local_addr: SocketAddr = "0.0.0.0:0".parse().unwrap();
           let socket = UdpSocket::bind(local_addr).await?;
           let buf = vec![0; 8196];
           let _ = socket.shutdown(Shutdown::Both);
           let _ = socket.recv_from(buf).await;
   
           Ok(())
       })
   }

2. Run the program with cargo run.

Expected Behavior

The program should handle the shutdown state gracefully, either by returning a specific error or by not panicking.

Observed Behavior

The program panics with the following message:

thread 'main' panicked at ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-uring-0.5.0/src/io/recv_from.rs:71:55: called `Option::unwrap()` on a `None` value