moved deadline method to FdHolder

doc.go

@@ -19,6 +19,7 @@ func Open() (Pty, Tty, error) {
 // FdHolder surfaces the Fd() method of the underlying handle.
 type FdHolder interface {
 	Fd() uintptr
+	SetDeadline(t time.Time) error
 }
 
 // Pty for terminal control in current process.
@@ -33,7 +34,6 @@ type Pty interface {
 
 	// WriteString is only used to identify Pty and Tty.
 	WriteString(s string) (n int, err error)
-	SetDeadline(t time.Time) error // TODO: Maybe move to FdHolder?
 
 	io.ReadWriteCloser
 }
@@ -47,7 +47,6 @@ type Tty interface {
 	FdHolder
 
 	Name() string
-	SetDeadline(t time.Time) error // TODO: Maybe move to FdHolder?
 
 	io.ReadWriteCloser
 }

pty_windows.go

@@ -34,7 +34,7 @@ var (
 	//                 the kernel32.dll is loaded from windows system path.
 	//
 	// Ref: https://pkg.go.dev/syscall@go1.13?GOOS=windows#LoadDLL
-	kernel32DLL = windows.NewLazyDLL("kernel32.dll")
+	kernel32DLL = windows.NewLazySystemDLL("kernel32.dll")
 
 	// https://docs.microsoft.com/en-us/windows/console/createpseudoconsole
 	createPseudoConsole = kernel32DLL.NewProc("CreatePseudoConsole")
@@ -138,8 +138,8 @@ func (p *WindowsPty) Close() error {
 	return err
 }
 
-func (t *WindowsPty) SetDeadline(value time.Time) error {
-	return nil
+func (p *WindowsPty) SetDeadline(value time.Time) error {
+	return os.ErrNoDeadline
 }
 
 func (t *WindowsTty) Name() string {
@@ -164,7 +164,7 @@ func (t *WindowsTty) Close() error {
 }
 
 func (t *WindowsTty) SetDeadline(value time.Time) error {
-	return nil
+	return os.ErrNoDeadline
 }
 
 func procCreatePseudoConsole(hInput windows.Handle, hOutput windows.Handle, dwFlags uint32, consoleHandle *windows.Handle) error {