if err := f.checkValid("SetDeadline"); err != nil {
		return err
	}
	return poll.ErrNoDeadline
}

// setReadDeadline sets the read deadline.
func (f *File) setReadDeadline(time.Time) error {
	if err := f.checkValid("SetReadDeadline"); err != nil {
		return err
	}
	return poll.ErrNoDeadline
}

// setWriteDeadline sets the write deadline.
func (f *File) setWriteDeadline(time.Time) error {

		if d == 0 {
			d = -1 // don't confuse deadline right now with no deadline
		}
	}
	if err := fd.incref(); err != nil {
		return err
	}
	defer fd.decref()
	if fd.pd.runtimeCtx == 0 {
		return ErrNoDeadline
	}
	runtime_pollSetDeadline(fd.pd.runtimeCtx, d, mode)
	return nil
}

// IsPollDescriptor reports whether fd is the descriptor being used by the poller.
// This is only used for testing.
//

// It is equivalent to calling both SetReadDeadline and SetWriteDeadline.
//
// Only some kinds of files support setting a deadline. Calls to SetDeadline
// for files that do not support deadlines will return ErrNoDeadline.
// On most systems ordinary files do not support deadlines, but pipes do.
//
// A deadline is an absolute time after which I/O operations fail with an

		{"DirEntry", Type, 16},
		{"DirFS", Func, 16},
		{"Environ", Func, 0},
		{"ErrClosed", Var, 8},
		{"ErrDeadlineExceeded", Var, 15},
		{"ErrExist", Var, 0},
		{"ErrInvalid", Var, 0},
		{"ErrNoDeadline", Var, 10},
		{"ErrNotExist", Var, 0},
		{"ErrPermission", Var, 0},
		{"ErrProcessDone", Var, 16},
		{"Executable", Func, 8},
		{"Exit", Func, 0},
		{"Expand", Func, 0},
		{"ExpandEnv", Func, 0},