refactor(net): split poll_fd into cfg-inners

Author: Berrysoft

compio-net/src/poll_fd.rs

@@ -0,0 +1,90 @@
+cfg_if::cfg_if! {
+    if #[cfg(windows)] {
+        #[path = "windows.rs"]
+        mod sys;
+    } else if #[cfg(unix)] {
+        #[path = "unix.rs"]
+        mod sys;
+    }
+}
+
+#[cfg(windows)]
+use std::os::windows::io::{AsRawSocket, RawSocket};
+use std::{io, ops::Deref};
+
+use compio_buf::IntoInner;
+use compio_driver::{AsRawFd, RawFd, SharedFd, ToSharedFd};
+
+/// A wrapper for socket, providing functionalities to wait for readiness.
+#[derive(Debug)]
+pub struct PollFd<T: AsRawFd>(sys::PollFd<T>);
+
+impl<T: AsRawFd> PollFd<T> {
+    /// Create [`PollFd`] without attaching the source. Ready-based sources need
+    /// not to be attached.
+    pub fn new(source: T) -> io::Result<Self> {
+        Self::from_shared_fd(SharedFd::new(source))
+    }
+
+    pub(crate) fn from_shared_fd(inner: SharedFd<T>) -> io::Result<Self> {
+        Ok(Self(sys::PollFd::new(inner)?))
+    }
+}
+
+impl<T: AsRawFd + 'static> PollFd<T> {
+    /// Wait for accept readiness, before calling `accept`, or after `accept`
+    /// returns `WouldBlock`.
+    pub async fn accept_ready(&self) -> io::Result<()> {
+        self.0.accept_ready().await
+    }
+
+    /// Wait for connect readiness.
+    pub async fn connect_ready(&self) -> io::Result<()> {
+        self.0.connect_ready().await
+    }
+
+    /// Wait for read readiness.
+    pub async fn read_ready(&self) -> io::Result<()> {
+        self.0.read_ready().await
+    }
+
+    /// Wait for write readiness.
+    pub async fn write_ready(&self) -> io::Result<()> {
+        self.0.write_ready().await
+    }
+}
+
+impl<T: AsRawFd> IntoInner for PollFd<T> {
+    type Inner = SharedFd<T>;
+
+    fn into_inner(self) -> Self::Inner {
+        self.0.into_inner()
+    }
+}
+
+impl<T: AsRawFd> ToSharedFd<T> for PollFd<T> {
+    fn to_shared_fd(&self) -> SharedFd<T> {
+        self.0.to_shared_fd()
+    }
+}
+
+impl<T: AsRawFd> AsRawFd for PollFd<T> {
+    fn as_raw_fd(&self) -> RawFd {
+        self.0.as_raw_fd()
+    }
+}
+
+#[cfg(windows)]
+impl<T: AsRawFd + AsRawSocket> AsRawSocket for PollFd<T> {
+    fn as_raw_socket(&self) -> RawSocket {
+        self.0.as_raw_socket()
+    }
+}
+
+impl<T: AsRawFd> Deref for PollFd<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}