Try setting the socket to be blocking

Author: MarcoPolo

p2p/transport/tcpreuse/internal/sampledconn/sampledconn_windows.go

@@ -6,10 +6,45 @@ import (
 	"errors"
 	"io"
 	"syscall"
+	"unsafe"
 
 	"golang.org/x/sys/windows"
 )
 
+const fionbio = 0x8004667e
+
+// updateBlocking updates the blocking mode of the file descriptor.
+// It returns true if the blocking mode was changed, and false if it was already in the desired mode.
+// If an error occurs, it returns the error.
+func updateBlocking(fd windows.Handle, blocking bool) (bool, error) {
+	// Determine the desired mode
+	var desiredMode uint32
+	if !blocking {
+		desiredMode = 1
+	} else {
+		desiredMode = 0
+	}
+
+	// Query the current mode
+	var currentMode uint32
+	err := windows.WSAIoctl(fd, fionbio, (*byte)(unsafe.Pointer(&currentMode)), 4, nil, 0, nil, nil, 0)
+	if err != nil {
+		return false, err
+	}
+
+	if currentMode == desiredMode {
+		return false, nil
+	}
+
+	// Update to the desired mode
+	err = windows.WSAIoctl(fd, fionbio, (*byte)(unsafe.Pointer(&desiredMode)), 4, nil, 0, nil, nil, 0)
+	if err != nil {
+		return false, err
+	}
+
+	return true, nil
+}
+
 func OSPeekConn(conn syscall.Conn) (PeekedBytes, error) {
 	s := PeekedBytes{}
 
@@ -18,6 +53,24 @@ func OSPeekConn(conn syscall.Conn) (PeekedBytes, error) {
 		return s, err
 	}
 
+	var updatedBlocking bool
+	ctlErr := rawConn.Control(func(fd uintptr) {
+		updatedBlocking, err = updateBlocking(windows.Handle(fd), true)
+	})
+	if ctlErr != nil {
+		return s, ctlErr
+	}
+	if err != nil {
+		return s, err
+	}
+	if updatedBlocking {
+		defer func() {
+			_ = rawConn.Control(func(fd uintptr) {
+				_, _ = updateBlocking(windows.Handle(fd), false)
+			})
+		}()
+	}
+
 	var readErr error
 	var n uint32
 	err = rawConn.Read(func(fd uintptr) bool {