io-uring: add readable/writable

src/utils/buffd.rs

@@ -1,4 +1,7 @@
-use {crate::async_engine::AsyncError, thiserror::Error};
+use {
+    crate::{io_uring::IoUringError, utils::oserror::OsError},
+    thiserror::Error,
+};
 pub use {
     buf_in::BufFdIn,
     buf_out::{BufFdOut, OutBuffer, OutBufferSwapchain},
@@ -14,9 +17,9 @@ mod parser;
 #[derive(Debug, Error)]
 pub enum BufFdError {
     #[error("An IO error occurred")]
-    Io(#[source] crate::utils::oserror::OsError),
-    #[error("An async error occurred")]
-    Async(#[from] AsyncError),
+    Io(#[source] OsError),
+    #[error("An io-uring error occurred")]
+    Ring(#[from] IoUringError),
     #[error("The peer did not send a file descriptor")]
     NoFd,
     #[error("The peer sent too many file descriptors")]