Implement conversions between OwnedFd and vsock types.

This allows a VsockListener, VsockSocket or VsockStream to be converted
to an OwnedFd and vice-versa.

Signed-off-by: Andrew Walbran <qwandor@google.com>

Author: qwandor

src/lib.rs

@@ -237,6 +237,18 @@ impl IntoRawFd for VsockListener {
     }
 }
 
+impl From<VsockListener> for OwnedFd {
+    fn from(value: VsockListener) -> Self {
+        value.socket
+    }
+}
+
+impl From<OwnedFd> for VsockListener {
+    fn from(socket: OwnedFd) -> Self {
+        Self { socket }
+    }
+}
+
 /// A virtio sequential packet socket between a local and a remote host.
 ///
 /// This is the vsock equivalent of [`std::net::UdpSocket`].
@@ -407,6 +419,18 @@ impl IntoRawFd for VsockSocket {
     }
 }
 
+impl From<VsockSocket> for OwnedFd {
+    fn from(value: VsockSocket) -> Self {
+        value.socket
+    }
+}
+
+impl From<OwnedFd> for VsockSocket {
+    fn from(socket: OwnedFd) -> Self {
+        Self { socket }
+    }
+}
+
 /// A virtio stream between a local and a remote socket.
 ///
 /// This is the vsock equivalent of [`std::net::TcpStream`].
@@ -554,6 +578,18 @@ impl IntoRawFd for VsockStream {
     }
 }
 
+impl From<VsockStream> for OwnedFd {
+    fn from(value: VsockStream) -> Self {
+        value.socket
+    }
+}
+
+impl From<OwnedFd> for VsockStream {
+    fn from(socket: OwnedFd) -> Self {
+        Self { socket }
+    }
+}
+
 const IOCTL_VM_SOCKETS_GET_LOCAL_CID: usize = 0x7b9;
 ioctl_read_bad!(
     vm_sockets_get_local_cid,