net: add ClientOptions.pipe_mode for named pipes

tokio/src/net/windows/named_pipe.rs

@@ -2272,6 +2272,7 @@ impl ServerOptions {
 pub struct ClientOptions {
     desired_access: u32,
     security_qos_flags: u32,
+    pipe_mode: PipeMode,
 }
 
 impl ClientOptions {
@@ -2293,6 +2294,7 @@ impl ClientOptions {
             desired_access: windows_sys::GENERIC_READ | windows_sys::GENERIC_WRITE,
             security_qos_flags: windows_sys::SECURITY_IDENTIFICATION
                 | windows_sys::SECURITY_SQOS_PRESENT,
+            pipe_mode: PipeMode::Byte,
         }
     }
 
@@ -2345,6 +2347,15 @@ impl ClientOptions {
         self
     }
 
+    /// The pipe mode.
+    ///
+    /// The default pipe mode is [`PipeMode::Byte`]. See [`PipeMode`] for
+    /// documentation of what each mode means.
+    pub fn pipe_mode(&mut self, pipe_mode: PipeMode) -> &mut Self {
+        self.pipe_mode = pipe_mode;
+        self
+    }
+
     /// Opens the named pipe identified by `addr`.
     ///
     /// This opens the client using [`CreateFile`] with the
@@ -2441,6 +2452,20 @@ impl ClientOptions {
             return Err(io::Error::last_os_error());
         }
 
+        if matches!(self.pipe_mode, PipeMode::Message) {
+            let mut mode = windows_sys::PIPE_READMODE_MESSAGE;
+            let result = windows_sys::SetNamedPipeHandleState(
+                h,
+                &mut mode,
+                ptr::null_mut(),
+                ptr::null_mut(),
+            );
+
+            if result == 0 {
+                return Err(io::Error::last_os_error());
+            }
+        }
+
         NamedPipeClient::from_raw_handle(h as _)
     }
 

tokio/tests/net_named_pipe.rs

@@ -349,9 +349,7 @@ async fn _named_pipe_mode_message(mode: PipeMode) -> io::Result<()> {
         .pipe_mode(mode)
         .create(&pipe_name)?;
 
-    let mut client = ClientOptions::new()
-        //.pipe_mode(mode)
-        .open(&pipe_name)?;
+    let mut client = ClientOptions::new().pipe_mode(mode).open(&pipe_name)?;
 
     server.connect().await?;